Thanks to a September 23, 2008 Oracle-L post by Jesse Rich, I was notified of a memory corruption problem in 10.2.0.4 Patch 5 and above.
According to Metalink Note 737957.1, the “problem is introduced by the fix of Bug 5386874 in 10.2.0.4, Patch 5.” Additional information found in the Note:
If the move to Patch 5 or higher has been made and there is no option to revert back to the situation before applying, then the following workaround can be considered:
“event=”10049 trace name context forever, level 2″
# memory protect KGL objs
Do NOT set this event at session level. Only set it in the init.ora / spfile.
It is not possible to get the corrected fix into Patch 9. The corrected fix is anticipated for Patch 10 but this cannot be guaranteed at the time of writing.
I forgot about this for a couple of months when I decided to check again. On November 6, 2008, the same note was updated with:
It is now confirmed that the correct fix is indeed made available into Patch 10.
Upon further investigation, it appears 10.2.0.4 Patch 12 (Patch 7522473) is the most recent patch available for 32-bit Windows.