I can already see this ending up badly,but whatever...

[teh lag]

He said it works when he makes it scenery so Its not bitmaps.

08.03.07 00:33:25 EXCEPTION halt in \halopc\haloce\source\tag_files\tag_groups.c,#3157 : #1 is not a valid bitmap_group_sequence_block index in [#0,#1)

Hint : don't post while on the drug you so proudly support in your sig; then you might have the mental capacity to notice that part of the error.

it could be a material effect that has a missing bitmap. so when he creates it as a vehicle it crashes but as a scenery it doesn't.

^

Also check HUDs, general effects, anything thast uses bitmaps ref'd by said vehicle.