Sending custom tokens while metamask is web3 provider gets stuck "pending"

[andersonmmi]

I've run into this issue a couple times now while developing the Ching! PoS plugin and using the new plugin API. The first time, my transactions were pending for several days. I had to reinstall metamask and then all my pending transactions went through at the same time.

Scene from most recent event yesterday at 5pm:

Just checked MM again:

Supporting feedback from xdai block explorer:

My address is 0xe8bF424E047372d249d0826c5567655ba3B72f18