Not able to finalise sync

[Lexin]

I'm posting my question here as well as sending it to the tech support guys, in case they're snowed under.

I can't seem to sync one of my realms. It won't stop trying to resolve, and I've been waiting for it to do so for in excess of ten minutes, which is three or four times as long as it's ever taken before. See the JPG attached for what it looks like.

Does anyone have any ideas about what I can do to make it sync up with the cloud? I don't really want to re-do the work I've just done on the realm, but I will if I have to.