http://bugs.winehq.org/show_bug.cgi?id=23249
--- Comment #15 from TCR toddroe@charter.net 2010-07-13 09:01:50 --- I was still having the issue even after compiling with the suggested 21609 patch with Ubuntu 10.04. So instead, I followed the "Newer versions of Wine (Not Recommended)" instructions at https://help.ubuntu.com/community/Wine to get the latest Wine release (1.2-RC6) and now Oblivion runs without issue.
Thanks guys!