Display Partially Freezes when Running PAH

[pennpal]

My display keeps partially freezing when I run multiple tables on one monitor with overlap. Parts of one table will be mixed in with parts of other tables, all the while I can't really play poker (hard to click bet or fold when the only thing displaying on the table is the flop and half of someones avatar, all superimposed over the table in front of it).

I tried to take a screenshot of this phenomenon to post, but the screenshot function didn't work at all, displaying an almost completely black screen.

This only seems to happen when I'm 12 tabling, and have 8 tables on one monitor and 4 on the other. The monitor with eight often lags up and chops up, to the point where I can't figure out what the hell's going on.

Can anyone help? Thanks a lot for any input, I really appreciate it.