The following is straight copy and paste from the Bethesda forums. I'm posting it here with permission from the original author. So since the launch of Fallout New Vegas Geck we have always had that one problem that stopped us being able to actually make interiors for our mods. It has been eating away at me for months and now finally after a week of trial and error (and about 100 crashes) I changed 10 lines a day and then it suddenly worked... so then it was just trial and error after then... I finally found the fix and can confirm it works! Vault3a all fully rendered after using my fix http://img156.images...nderworking.jpg The fix is actually simple! Load up GeckCustom.ini located in your documents/my games/FalloutNV and find the line "bUseMultibounds=1" Change that "1" to a "0" so it should say "bUseMultibounds=0" Save and fire up the geck... And it works.
