All my characters seem to have maxed out at 89,000 exp, except those that are multi-class such as Fighter/Druid and Cleric/Ranger. They seem stuck at 44,500. What's the deal???

Hello you are right this is an exp. cap for bg1. I think if you get totsc the exp. cap goes up to 161 000. So you can get at least one more level. It is worth buying this atleast for the cool weapons you can get. Or you could always get the patch to take out the exp. cap I never did this because I play the games they where supose to be played .