PCS:CTD during exterior-interior transitions
Oblivion crashes randomly during interior-exterior transitions.
Causes and Solutions
Cause 1 - Buggy OBGE DLL
This type of crash can be cause by the old, buggy OBGE.dll (used by mods such as Screen Effects).
Solution #1: Remove the buggy OBGE.dll and install Oblivion Graphics Extender. Only the Core file is necessary.
Cause 2 - Pluggy
Certain versions of Pluggy can cause this type of crash, as well as a number of other types of crashes.
Solution #1: Upgrade to Pluggy to version 125 or Dev 132.
Cause 3 - WeOCPS
This is an alpha-state OBSE plugin, and most likely it will remain that way. The extent of its instability is unknown, but it is a possible source of crashes of this nature.
Solution #1: Uninstall WeOCPS.
Cause 4 - Bloom lighting & Anti-Aliasing conflict
Both Bloom lighting and Anti-Aliasing are enabled in game's video settings.
Solution #1: Disable Anti-Aliasing. Some users found they needed to disable both. Some video cards can successfully enable Anti-Aliasing on the card itself but not in the game settings.
Oblivion Graphics Extender
Oblivion Script Extender