Hi Ubuntu6226, more then ten years have passed since your bug report and I believe the issue you describe isn't present in dwm 6.5 anymore.
I've tried opening a video in my terminal emulator with mplayer, then I've put it to fullscreen pressing F, finally I've switched monitor with Mod1-, or Mod1-. I kept the video in fullscreen while I was working on the other monitor. In dwm, you can move the focused window to a previous screen with Mod1-Shift-, or to the next one with Mod1-Shift-. In this case the focused window is mplayer playback window. Please, let me know if you can reproduce the bug with dwm 6.5 and how. I'll wait for a month, then I'll close the bug report. -- Matteo Bini
