Quest Editor crashes in sample quest

[mbombe]

On my Windows 7 box, the following happens with Quest Editor 1.5.3 and the unaltered sample quest:

Load Sample Quest, immediately start Sample Quest, rush right stairs down, up, up, CRASH. Reproducible every time if I rush. It does NOT happen when exploring slowly. it seems to be related with rushing the last room with the 4 birds,

[Diarandor]

Is there some error? This might be due to some changes in the folder tree (changes related to the assets and some file not found by some script) or some enemy script (probably on the next map, before the error).

[mbombe]

No error, the quest just freezes for 2-3 seconds and then shows the crash window as per screenshot.
The issue only appears if I rush through the room. If I fight the birds a bit before moving on, it does not crash.