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  • Interesting. Is it always a particular application? Is the application still visible with xlsclients? Can you test with a different window manager (say, fvwm), and see if it shows the same problem? If not, that would point to a bug in XFCE. Commented Mar 14, 2019 at 8:56
  • @dirkt I thought at first it was related to video playback in Youtube (Firefox). However, the problem persists even after killing all instances of Firefox. I have yet to find anything that correlates with it except video playback. While killing Firefox doesn't stop the problem, perhaps the problem is still somehow connected to video playback. I have not tried a different window manager. I might consider doing that. Commented Mar 14, 2019 at 16:40
  • So is what appears the closed video playback window, or does part of the closed application appear? X uses special acceleration for video playback, so if only the video playback window appears, that would narrow down the problem. Commented Mar 15, 2019 at 6:42
  • @dirkt unfortunately this problem is not specific to hardware overlay or similar video playback schemes. I can get previously closed windows of any kind. Commented Mar 17, 2019 at 22:19