Oh poo.
I think it's caused by Haunted Forest. No idea how to fix it though. I even considered getting Pangaea's caster to commit suicide, but I'm not sure how to do it.
I wonder whether someone could do a dispel. Maybe I can take a look to see if anyone has enough gems and try that, and get everyone else to send that player gems.
Obviously this is pretty unfair on Pangaea though, who presumably had Haunted Forest as a big part of his strategy.
The good news is, if I didn't mention it before, I sent the files to Johan K (the programming half of Illwinter) and he's taken a look, so most probably this bug will be fixed in the next patch. It's never come up before though - I guess either Haunted Forest is rarely cast (unlikely) os some other issue is interacting with it to cause problems.