I wanted to add another observation I have just had.
If I open up an OLD album in Jalbum 37.5 , low and behold the drag & drop function works as expected, but still not with a very recent or new album created fresh.
So my observation is that maybe this is an issue with the particular settings created in a recent or new album created with 37.5 ??
I don't want to argue, but I don't think that's possible. The behavior of the
Explore window in jAlbum is independent of what version was used to create a particular project. The jAlbum preferences aren't stored with the project - only the settings for that project, things like skin, font choices, colors, etc.