Max closes itself when I unwrap (sometimes)

This is really annoying me now. I'm using max8 and it is frequently bombing out when I unwrap stuff. When I apply a UVW unwrap modifier, a maxscript window pops up for a second and then max closes itself without error.

This has happened quite a few times now and it's really goddamn annoying. To sort it, I have to export to a format that maya can read, apply an unwrap modifier in maya and then re-import back into max. Doing so results in the unwrap modifier working properly in max, but it's not much of a fix.

Anyone encountered similar problems? Any help appreciated.

yup, SP3

I always save before I unwrap, but that doesn't solve my problem. Currently if I want to unwrap anything I have to go max->maya->max again.

I've given up and I'm going to reinstall it. I'll be back here moaning like a bitch if that doesn't sort it out.