LogMeIN Guardian has detected a problem with the LogMeIn software...

I think I found the problem, and a fix.

It seems like if your Log Me In credentials are the same as your PC's login credentials, it causes this error. To resolve, reset your LMI password to one that's different from your PC's password. One way to do this is to start LMI, go to View > Options and click Delete all stores login credentials, and then when the password prompt come up, click Forgot Password.