Crash on certain maps when droids explode on death

[Giftheck]

I'm encountering a peculiar crash on two of Red04's maps: Utapau and Mygeeto.

If the Droideka explodes, the game immediately crashes. I'm told this might be a collision issue because it has happened in SWBF2 on Mygeeeto as well.

Anybody come across this and found a fix?

EDIT: this issue also occurs with the standard battle droid explosions too.

EDIT 2: investigating further, the compiled versions of these maps are about 4MB lighter than the ones in Red04's addon pack and I can't figure out why - I've not changed anything about Utapau to begin with and the only thing changed on Mygeeto was changing the Bespin AAA turrets to Recoilless turrets.