diff --git a/filmatyk/filmweb.py b/filmatyk/filmweb.py
index 4ba6ddc..68b08af 100644
--- a/filmatyk/filmweb.py
+++ b/filmatyk/filmweb.py
@@ -1,8 +1,10 @@
 from datetime import date
+import binascii
+import html
 import json
+import pickle
 
 from bs4 import BeautifulSoup as BS
-import html
 import requests_html
 
 import containers
@@ -10,6 +12,7 @@
 
 ConnectionError = requests_html.requests.ConnectionError
 
+
 class Constants():
   """URLs and HTML component names for data acquisition.
 
@@ -51,6 +54,8 @@ def login(username, password):
     auth_package = {
       'j_username': username,
       'j_password': password,
+      '_login_redirect_url': '',
+      '_prm': True,
     }
     # Catch connection errors
     try:
@@ -77,11 +82,19 @@ def enforceSession(fun):
       https://stackoverflow.com/q/21382801/6919631
       https://stackoverflow.com/q/11058686/6919631
     The bottom line is that it should NEVER be called directly.
+
+    Also checks if the session cookies were changed in the process of making
+    a request.
     """
     def wrapper(*args, **kwargs):
       self = args[0]
       if self.checkSession():
-        return fun(*args, **kwargs)
+        old_cookies = set(self.session.cookies.values())
+        result = fun(*args, **kwargs)
+        new_cookies = set(self.session.cookies.values())
+        if old_cookies != new_cookies:
+          self.isDirty = True
+        return result
       else:
         return None
     return wrapper
@@ -91,6 +104,7 @@ def __init__(self, login_handler, username:str=''):
     self.constants = Constants(username)
     self.login_handler = login_handler
     self.session = None
+    self.isDirty = False
     self.parsingRules = {}
     for container in containers.classByString.keys():
       self.__cacheParsingRules(container)
@@ -147,11 +161,16 @@ def checkSession(self):
     (cause we'll nearly always have a session, except it might sometimes get stale
     resulting in an acquisition failure)
     """
+    session_requested = False
     if not self.session:
       self.requestSession()
+      session_requested = True
     # Check again - in case the user cancelled a login
     if not self.session:
       return False
+    # If a new session was requested in the process - set the dirty flag
+    if session_requested:
+      self.isDirty = True
     # At this point everything is definitely safe
     return True
 
@@ -172,6 +191,24 @@ def requestSession(self):
           return None
     self.session = session
 
+  def storeSession(self):
+    """Stores the sessions cookies to a base64-encoded pickle string."""
+    if self.session:
+      cookies_bin = pickle.dumps(self.session.cookies)
+      cookies_str = binascii.b2a_base64(cookies_bin).decode('utf-8').strip()
+      return cookies_str
+    else:
+      return 'null'
+
+  def restoreSession(self, pickle_str:str):
+    """Restores the session cookies from a base64-encoded pickle string."""
+    if pickle_str == 'null':
+      return
+    self.session = requests_html.HTMLSession()
+    cookies_bin = binascii.a2b_base64(pickle_str.encode('utf-8'))
+    cookies_obj = pickle.loads(cookies_bin)
+    self.session.cookies = cookies_obj
+
   @enforceSession
   def getNumOf(self, itemtype:str):
     """Return the number of items of a given type that the user has rated.
diff --git a/filmatyk/gui.py b/filmatyk/gui.py
index 959ef2a..76948b2 100644
--- a/filmatyk/gui.py
+++ b/filmatyk/gui.py
@@ -77,10 +77,12 @@ def __construct(self):
     self.passwordEntry = tk.Entry(master=cw, width=20, show='*')
     self.passwordEntry.grid(row=2, column=1, sticky=tk.W)
     self.passwordEntry.bind('<Key>', self._setStateGood)
+    self.rememberBox = tk.Checkbutton(self.window, text='pamiętaj mnie', variable=Options.var('rememberLogin'))
+    self.rememberBox.grid(row=3, column=1, columnspan=2, sticky=tk.W)
     self.infoLabel = tk.Label(master=cw, text='')
-    self.infoLabel.grid(row=3, column=0, columnspan=2)
-    tk.Button(master=cw, text='Zaloguj', command=self._loginClick).grid(row=4, column=1, sticky=tk.W)
-    tk.Button(master=cw, text='Anuluj', command=self._cancelClick).grid(row=4, column=0, sticky=tk.E)
+    self.infoLabel.grid(row=4, column=0, columnspan=2)
+    tk.Button(master=cw, text='Zaloguj', command=self._loginClick).grid(row=5, column=1, sticky=tk.W)
+    tk.Button(master=cw, text='Anuluj', command=self._cancelClick).grid(row=5, column=0, sticky=tk.E)
     self.window.withdraw()
 
   def centerWindow(self):
@@ -171,6 +173,7 @@ def __init__(self, debugMode=False, isOnLinux=False):
     self.presenters = []
     # instantiate Presenters and Databases
     self.api = FilmwebAPI(self.loginHandler.requestLogin, userdata.username)
+    self.api.restoreSession(userdata.session_pkl)
     movieDatabase = Database.restoreFromString('Movie', userdata.movies_data, self.api, self._setProgress)
     self.databases.append(movieDatabase)
     moviePresenter = Presenter(self, self.api, movieDatabase, userdata.movies_conf)
@@ -240,7 +243,8 @@ def centerWindow(self):
     y = hs/2 - h/2
     self.root.geometry('+{:.0f}+{:.0f}'.format(x, y))
 
-  #USER DATA MANAGEMENT
+  # USER DATA MANAGEMENT
+
   def getFilename(self):
     if self.debugMode:
       return self.filename
@@ -249,14 +253,24 @@ def getFilename(self):
     return os.path.join(userdir, subpath)
 
   def saveUserData(self):
+    """Save the user data, if any of it has changed during the run time."""
     # if for any reason the first update hasn't commenced - don't save anything
     if self.api.username is None:
       return
+    # if the session is set to be stored - serialize it
+    # if it is also dirty - set the flag for a check later
+    session_pkl = 'null'
+    session_isDirty = False
+    if Options.get('rememberLogin'):
+      session_pkl = self.api.storeSession()
+      if self.api.isDirty:
+        session_isDirty = True
     # if there is no need to save anything - stop right there too
     if not (
         any([db.isDirty for db in self.databases]) or
         any([ps.isDirty for ps in self.presenters]) or
-        Options.isDirty
+        Options.isDirty or
+        session_isDirty
       ):
       return
     # construct the UserData object
@@ -269,6 +283,7 @@ def saveUserData(self):
       games_conf=self.presenters[2].storeToString(),
       games_data=self.databases[2].storeToString(),
       options_json=Options.storeToString(),
+      session_pkl=session_pkl,
     )
     # request the manager to save it
     self.dataManager.save(serialized_data)
@@ -277,6 +292,8 @@ def saveUserData(self):
       db.isDirty = False
     for ps in self.presenters:
       ps.isDirty = False
+    Options.isDirty = False
+    self.api.isDirty = False
 
   #CALLBACKS
   def _setProgress(self, value:int, abort:bool=False):
diff --git a/filmatyk/options.py b/filmatyk/options.py
index 7ca72c7..9a1a7aa 100644
--- a/filmatyk/options.py
+++ b/filmatyk/options.py
@@ -33,6 +33,7 @@ class _Options():
   Defining a new option is done simply by adding it to the prototypes list.
   """
   option_prototypes = [
+    ('rememberLogin', tk.BooleanVar, True),
   ]
 
   def __init__(self):
diff --git a/filmatyk/userdata.py b/filmatyk/userdata.py
index 9aa9ea1..3632907 100644
--- a/filmatyk/userdata.py
+++ b/filmatyk/userdata.py
@@ -46,23 +46,25 @@ class UserData(object):
   def __init__(
     self,
     username='',
+    options_json='{}',
+    session_pkl='null',
     movies_conf='',
     movies_data='',
     series_conf='',
     series_data='',
     games_conf='',
     games_data='',
-    options_json='{}',
     is_empty=True
   ):
     self.username = username
+    self.options_json = options_json
+    self.session_pkl = session_pkl
     self.movies_conf = movies_conf
     self.movies_data = movies_data
     self.series_conf = series_conf
     self.series_data = series_data
     self.games_conf = games_conf
     self.games_data = games_data
-    self.options_json = options_json
     self.is_empty = is_empty
 
 
@@ -104,6 +106,8 @@ def save(self, userData):
       user_file.write(userData.username + '\n')
       user_file.write('#OPTIONS\n')
       user_file.write(userData.options_json + '\n')
+      user_file.write('#SESSION\n')
+      user_file.write(userData.session_pkl + '\n')
       user_file.write('#MOVIES\n')
       user_file.write(userData.movies_conf + '\n')
       user_file.write(userData.movies_data + '\n')
@@ -153,12 +157,13 @@ def readFile(self):
     This always has to be done first (independent of the actual content), as
     the version string must be extracted before doing anything further.
     Lines starting with '#' are always ignored as comments.
+    Empty lines are always ignored.
     """
     with open(self.path, 'r') as user_file:
       user_data = [
         line.strip('\n')
         for line in user_file.readlines()
-        if not line.startswith('#')
+        if not line.startswith('#') and len(line) > 1
       ]
     return user_data
 
@@ -205,8 +210,8 @@ def decorator(loader):
 class Loaders(object):
   """Just a holder for different data loading functions.
 
-  It's friends with DataManager class, that is: updates its "loaders" ODict
-  with any loader defined here.
+  It's friends with DataManager class, that is: updates its list of loaders
+  with all loaders defined here.
   """
   @DataManager.registerLoaderSince('1.0.0-beta.1')
   def loader100b(user_data):
@@ -225,10 +230,11 @@ def loader100b4(user_data):
     return UserData(
       username=user_data[1],
       options_json=user_data[2],
-      movies_conf=user_data[3],
-      movies_data=user_data[4],
-      series_conf=user_data[5],
-      series_data=user_data[6],
-      games_conf=user_data[7],
-      games_data=user_data[8],
+      session_pkl=user_data[3],
+      movies_conf=user_data[4],
+      movies_data=user_data[5],
+      series_conf=user_data[6],
+      series_data=user_data[7],
+      games_conf=user_data[8],
+      games_data=user_data[9],
     )