Xnotfier not signing in to all accounts Version 3.5.6 on FF 37.0.2

This is happenoing on all of my 4 PC's, I have 6 Gmail accounts, and on one only one signs in, and, it is not always the sames ones that don't sign in. I have tried everything, clearing cache, I check all passowrds in FF password manager to make sure they were correct. I even created a new profile and the same issue. I can't believe I am the only one having this issue, this is happening on 4 different PC's. My emails login fine on my Android devices with no issues. I am able also to login to all of my accounts manually, so I know it is not a Gmail issue. Please advise and those of you having the same issue, please post here, so the Dev can see others are having the same issue.

Don