Sorry, it took me quite a time to break it down this far.

You can download the projekt here:

http://www.meteormess.de/files/crash_test.rar

Here's all info I was able to find out:

1) change line "flags = SHOW | NOFLAG1;" to any other flag-combination (only SHOW or only NOTFLAG1" => crash is gone

2) change "video_mode" to 8 => crash is gone

3) modify a random model with prefix "telescope_" (models located in the telescope_room) => crash is gone

4) load only one of the rooms (green_tentacles_room or telescope_room) => crash is gone

I don't see any relations between all those stuff ... I hope you can help.