ok i've had this problem before
it's because generations uses a modified version of the Team Arena start up
have you got any map files other than the gen files in the generation folder or Base q3 folder
usually it's maps that were first designed on 1.17 or 1.16n revisions that are now incompatible with 1.32
such as piedm1 and mario opposing castles ( which by the way is an excellent map for weapons factory)
it's due to the coding of these map that effects the pages
try taking out all the extra maps you have then trying them 1 at a time to see which ones send the screen funny
you'll probably find it's only one or two and the rest work just fine