Hi there,
Was just logging in to read the latest release notes and kind of hoped this one would be fixed as part of it. Seems that's not the case .
We've been having Twitter post issues from both the website and the iPhone app for a few weeks now. A local group of us use Twitter to share our finds and this seems to have stopped working for all of us.
I can echo the comments about the "unexpected error occurred" message which we've been experiencing and I've tried the same possible workarounds.
Just yesterday I setup a brand new Twitter account, attached the gc.com site to that and I'm still getting this error.