Well, there must be something else involved or amiss. Sometimes that procedure works and sometimes it does not. If I am successful in DD one image to the UI, then 100% of the time I will be unable to DD a second image. So far, it looks like the most successful approach is to DD one image, then exit the app, and then re-open it and DD another image. That seems to work most of the time (but not always). BTW, I'm using XP SP3.
Didn't AspeQt have one release which was installed? I was thinking that there was no issue with DD on that one, but it's been awhile, so might be a "false memory."
Edit: I dug out my older version of AspeQt which is installed and it has no issues with drag and drop. I think this issue is RespeQt only. Clarification: Aspeqt Preview 7 runs from a folder on the C; drive, but is not installed via the registry.