Removing first items and que fixes crash--why?

[fyz]

Hi,

I have been running an experiment on Medialab for the past year. Everything was fine at first and I managed to complete the experiment with up to 60 participants. But recently the program has been crashing. It often crashes at two particular points, both during the transition from a html item to the next item. The error prompt would show "Medialab Research Software has encountered a problem and needs to close".
After much trial and error, I found out that if I remove the first few items and .que from the .exp, the rest of the experiment seems to work fine. Can anyone please help me with this? I am running Medialab2008.1.20 on Windows Xp with IE7.

Here is the error signature (if it helps):
AppName: medialab.exe
AppVer: 2008.1.0.20
ModName: ntdll.dll
ModVer: 5.1.2600.3520
Offset: 0000120e