Staff are on holiday at this time until the 5th Jan... let me buzz someone...
Thanks Geoff. If it helps, I've had it working in the past, but I ended up wiping the computer (and my time machine backup didn't work!) and losing everything that I thought I wouldn't lose. So at this time, I think it's got a kink in the system they will have to iron out on their end where my account was syncing and working before, and now it wants to sync a new catalog and it's not taking it. It could also still be my desktop LR not playing nice with Yosemite, but that's why I'm here. I don't really want to uninstall and reinstall LR on my Mac.
I have asked a staff member to check this thread out but as I said holidays.
You won’t do any harm uninstalling and reinstalling Lightroom and it is very easy.
Worth a go but I suspect it is some backroom issue...