>Even though the machine's configuration "did not change", check the version of comctl32.ocx with the version you used when developing. If it got overwritten with another version, the form will fail because it can't find the exact version that is associated with the OLEControl.

I don't think this is the problem: I also copied the ocx-file itself, and although there are two versions around, these are compatible. I tested this on my own machine.

Auke