I was fighting the Lich in the sewers and I polymorphed Jan into a jelly to defend against his spells... now that I have killed the Lich Jan can't unploymorph. How do I do it. I went back to his special abilities and it just shows set snare and create boomers. I tried to dispel magic with a spell from Jaheira but that didn't do it. Help!

Either wait for it to wear off or try and use a more powerful dispell (the priest version doesn't do anything does it?!)

If you go into his special abilities Ithink there should be an Icon in the shape of a man/gnome. Clck on that and he should turn bcak to normal. Of course that's the obvious thing so you have probably already tried that. If so, have a look at these earlier posts for some ideas. If it is a bug hopefully you'll be able to solve it like the guy in the posts did. Good luck :)
http://www.sorcerers.net/ubb/Forum2/HTML/001738.html
http://www.sorcerers.net/ubb/Forum2/HTML/002351.html