I have had a problem with my screen freezing especially in multi player games. WGT said to use Chrome as it works best and also to use
"To clear your Flash Cache...
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Visit Macromedia Adobe at: http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html
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In
the Global Storage Settings Panel, change the Global Storage Settings
to 100K or higher, and select the "Allow Third-Party Flash Content..."
and "Store Common Flash Components..." options
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In the Website Privacy Settings Panel, click Delete All Sites to clear the Flash Cache"
I will use that and see if there are any issue.
I have put a notice up for others who may have this problem.