I try using Alt-Tab to switch to another window, and can see the window in Alt-Tab task switcher, but when I select it, it doesn't open. This happens to me for example with the Text Editor and also the File Manager, and has happened multiple times.
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1I'm voting to close this question as off-topic because it's not a programming question. I suggest deleting it and posting in [ubuntu.se]. You should also specify which desktop environment you're using. – Keith Thompson Jul 13 '17 at 18:09
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Couldn't find any answer to this and finally figured it out, so I am sharing.
It turns out you can send windows to another workspace by mistake, even if you don't have workspaces enabled.
I solved this and found my missing windows by:
enabling workspaces, and then
switching to the next workspace, where I found my missing windows and then sending them back to my primary workspace.
1) To enable workspaces, go to: System Settings > Appearance > Behavior and click on the Enable workspaces checkbox.
2) To switch to the next workspace, use the keyboard shortcut: CTRL+ALT+→
Then select the window you've been missing, and send it back to the first workspace if you'd like, with: SHIFT+CTRL+ALT+←

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