Fails to recognise resource types

[cheunr02]

I have WebStorm 2018.2.5 on Mac with 0.6.5 of plugin.
For example -

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "LogGroup": {
      "Type": "String",
      "Description": "Name of AWS::Logs::LogGroup"
    }
  },
  "Resources": {
    "CloudwatchLogGroup": {
      "Type": "AWS::Logs::LogGroup",
      "Properties": {
        "LogGroupName": {
          "Ref": "LogGroup"
        },
        "RetentionInDays": 30
      }
    }
  }
}

WebStorm highlights "AWS::Logs::LogGroup" that is should be one of a long list of types which clearly it is correctly typed in. All other properties seem to be working - but anything inside the Resources field has the same issue.
When i alt-enter and replace my loggroup with a "valid one" from the suggested list - it still warns.

Maybe I'm installing it incorrectly?

[mab4058]

(version 0.6.5 in PyCharm 2018.2.4)

  MyLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      ...

I'm having the same issue with the AWS::Lambda::Function resource.

Here is the message I'm seeing when inspecting the highlighted resource type:
"Schema validation: Value should be one of: ["AWS::ApiGateway::Account"] less... (Ctrl+F1)
Inspection info: Validates YAML file against a JSON Schema, if the schema is specified"