I'm also having the same problem, as well as
Changing password hasn't fixed things.
Seems to be a rash of other problems in other recent threads. Suggests some sort of network problems at GR; hoping not a security breach - but I'd be feeling a little worried (paranoid?) if my GR password was reused somewhere else.
The same's happening here since last week.
Not forgetting the message "We have encountered problems communicating with one or more project servers" just after logging on Gridrepublic's website...