I can only select one party member (the middle).
When selecting another party member I
select that one anyway.
Dialog options are always the one in the middle.
The screen moves when I move the party member and won't move otherwise.
HELP ME!!!

have you looked in the other posts for this problem or a patch to fix this? or else you should look at the links of other bug related posts, maybe there is some way to fix your problem.

indeed... do you already have a patch installed or not yet? It will solve most of the problems I suppose. When that doesn't work just reinstall the whole game.

This is perhaps a way to obvious question but - I suppose the rest of the party haven't been confused, stunned or subjected to horror have they? There are a number of spell affects that can be cast on the party that make them uncontrolable or selectable by you. Sorry if that was far too obvious but you never know.