I'm having a problem in Ultima III in a dungeon near the Lord British castle. Whenever I get to the fountain the game queries me to select a party member to drink from and just locks on keeping on asking who shall drink from it. As I can't leave that screen, I have to close the game...Anybody else had that problem?
(EDIT) Man do I feel dumb, all I had to do is press 0 so that no one drinks from the fountain...although until this point I don't think any menu used the 0 key, normally it was only the (Q)uit...

The early Ultima games were full of weird porting quirks.