Blank area at top of maximized windows in dual-monitor system

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    Blank area at top of maximized windows in dual-monitor system

    When running certain programs in my Windows 10 v. 1909 system with two monitors, sometimes a window displayed full-screen on one monitor (in my case, the one interfaced via the VGA port) will have a ~1" blank area at the top of the screen right below the title bar. (See the screenshot below.) From this point on, the system behaves as if that area of the window, as well as the title bar, is not there. For example, clicking the close "X" or the restore down icon at the top right of the screen will instead close or restore down any full-screen program that is underneath the problem one. Clicking areas or buttons below the blank area may or may not do anything. The problem occurs only if the window is maximized; a "normal" window, even if almost the same size as a maximized one, is not affected.

    Once the problem occurs, some but not all other programs, both 32-bit and 64-bit, also become infected. However the problem always seems to start with Mozilla Thunderbird. Closing down and restarting the programs doesn't help. The only way I've found to semi-permanently cure the problem is to reboot, at which point things will be fine for the next few hours or days until they aren't.

    Some programs that *are* affected: Thunderbird, Firefox, Notepad, Macro Exchange Pro32, VLC Media Player, Irfanview

    Some programs that are *not* affected: Word, Excel, Outlook, Powerpoint, Notepad++, PDFXchange Editor, Jarte, Mathcad, Visual Studio, Macrium Reflect

    I'm posting this problem both here and in a Mozilla forum, as I don't know if the cause is Windows 10 (it didn't happen with Windows 7) or Thunderbird, or some combination of the two.

    Update: Since posting, I've updated Windows to v. 2004. The problem still occurs. I've also substituted a perhaps more informative image for the original. Note the blank area at the top and the title bar, which is nonfunctional.
    Attached Thumbnails Attached Thumbnails Blank area at top of maximized windows in dual-monitor system-2020-07-23-16_15_25-greenshot.jpg  
    Last edited by coffent; 23 Jul 2020 at 15:26. Reason: Update
      My Computer


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