Have you tried using the FFS Debugger to force errors on all objects? That tends to fix some problems on the lot such as this.
FFS Lot Debugger 2.0NW -
http://www.moreawesomethanyou.com/smf/index.php?topic=72.0XIX. FORCE ERRORS (experimental)
Forces all objects of specified locality (all/in-world/off-world) to
error. Do not run while debug mode is ineffect or thousands of error
dialogs may appear! May crash, freeze or spam your game. Consult your
doctor before use.