We have a long experiment, around 650 response scale items, and MediaLab freezes after around 450 items or so. It has never gone through all of them. The background screen appears, but no item appears. It just stays like that. MediaLab handles each individual questionnaire fine (the longest is 240 items). Basically, it resembles the old "crash at 150" bug that was fixed in November and has been extensively discussed here.

The specs: MediaLab has failed on both Windows XP SP2 and Windows 7 Enterprise. Both computers have images less than 2 weeks old, and both have a version of MediaLab that was downloaded last week.

Any tips?