Analyzing the code, found that the error happens on LoadPicture(), as it was its result that was passed to ImageList as a parameter. Ran the same test, with also checking for LoadPicture on all icons in the project. Now it's getting weird - in the current project many more icons now fail the loadpicture test. In the previous version of it, just a few (well, those were from the old batch of icons). For the _screen.icon test, it's only a few, but... the one I uploaded here is 16x17. Reduced that to 16x16 (using Gimp) and guess what, it's now passing the _screen.icon test, but still fails the loadpicture().

What's the API behind loadpicture()? May I be having a wrong version of gdi+? What's the proper version?