Client still lists my sync'd Origin games, but the ones I have installed don't show on the Installed list and the plugin itself won't connect.

I've tried restarting Galaxy and my PC with no luck. Even disconnecting and reconnecting didn't work

Origin itself works fine, so it's not a login issue there.

All other plugins are working fine.

Same here. The Origin tab still shows, but, not the installed game and it doesn't connect, no matter how many times I Retry.

I have a similar error/crash, in my particular case, it works for a few seconds. In that moment, the play button appears and you can launch a game, but after a few seconds it crash again with the same message. Im using Windows 7.

Origin has always been a pain to me from the beginning, but disconnecting and reconnecting always works for me! Since this is not a widespread situation, I'd suggest (if you haven't done so already) you guys send separate 'report issue' and make sure to include you 'logs' folder as instructed. So, maybe they can cross-correlate the issues.