If input shape mask is set on a window, dragging an item over the window doesn't take this mask into consideration - this bug is clearly visible on various dock apps (ie Awn, Cairo dock), there are dead DnD zones etc. Workarounds have to be implemented if using input shape masks and DnD (proxying the drag manually to underlaying window), which can be tricky to do if using multiple X windows in the app. As an example of this bug see: https://bugs.launchpad.net/awn/+bug/390889 https://bugs.launchpad.net/notify-osd/+bug/347053
Sounds more like a server bug.
Mass closure: This bug has been untouched for more than six years, and is not obviously still valid. Please file a new report if you continue to experience issues with a current server.
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