This may sound strange, but you want to try backing up one Version on your video drivers (to 44.03, I believe). I had to do that to make Disney's Toontown (no snide remarks, please ) stable on my system. According to their tech support, the newest nVidia drivers have some issues.
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My SEIV Code: L++++ GdY $ Fr+++ C-- S* T? Sf Tcp A%% M+++ MpT RV Pw+ Fq Nd- RP+ G++ Au+ Mm++(--)