Having the same problem with garbled graphics. Happens only when using the Intel card, when switching to Nvidia everything seems fine.
Usually random parts of web pages in Safari are garbled, or video played in QuickTime X. This morning part of my garbled Safari window appeared on my desktop. Safari version is 5.0.2.
Also frequently getting the following example errors in Console.app:
com.apple.WebKit.PluginAgent[196] mbp.lan WebKitPluginHost[6498] <Error>: unknown error code: invalid context
[0x0-0xd00d].com.apple.Safari[191] mbp.lan Safari[191] <Error>: unknown error code: invalid drawable
WebKitPluginHost[9050] unknown error code: invalid context
Finder[320] unknown error code: invalid drawable
QuickTimePlayer[4627] unknown error code: invalid drawable
kernel The graphics driver has detected a corruption in its command stream
Didn't always happen. Seems to have started since I upgraded my Flash plugin. Current version 10.1 r85.
Restarts don't seem to fix the problem.
Havent had a chance to call the help desk (not that I believe it would help based on previous experiences).
N.B. also posted in this thread:
http://discussions.apple.com/thread.jspa?messageID=12397198�