My program makes use of dragimages. The code works well for Windows and Linux (both Gtk2 and Qt) but not with Qt on Darwin. I fiddled around with drawing (visible on/off, cursor on/off) but nothing helps, the dragimage is still shown scrambled. Sometimes it works as expected but mostly not. I checked image generation and transfer to the imagelist, both are okay. At the moment I have no idea what could be wrong.
Actually, a small test program runs perfectly but my program has a lot of code around the mouse down event so I don't know what happens. Seems Darwin does not forgive any mistake.
Any suggestion?