We're developing a +- 400 000 LOC program that extensively used drag-and-drops to simplify the interface. However, recently, it became impossible to drag-drop ANYTHING from an external application into the program. AllowDrop isn't changed anywhere and it seems that drag-and-drop still works on some of our developers' computers overseas but not on mine. For instance, I can't drag drop a picture from IE or a file from Explorer into my application. But draggingsomethingfrom the application into another part of the application still works. I'm using Windows 7 x64 and have no other problems so far. Is there some sort of system-wide setting that is affecting this?

Thanks for the help. There's nothing unusual in the output window. The program just became unable to trigger any .DragEnter or any other drag-drop related events. The cursor shows a can't drop icon when I drag something from external programs.

Sorry, I miscommunicated. I was trying to say that DragEnter never gets called if the source of the drag comes from outside the application

This could potentially be a settings issue. The code works on other computers. I tried running the executable directly and tried compiling with admin rights...