I found a bug, I think, in your code Goldenix. The Function: _UDF_SKINGUI_DELETE($Form1_GUI) tries to release the Image resource with this code: I don't think it was working properly. It may just be due to you not using #Include <WinAPI.au3>. I didn't spend enough time trying to find out why it wasn't working. I did, though, get it working by adding ImageDispose using the GDIPlus function. I added he following line of code in Blue: (I just left the other code in case it is supposed to work some sort of way...