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Looking for first steps to diagnose this strange change in behavior: If I launch mate-screenshot and choose Copy to Clipboard, no program will paste the image, including:

  1. The StackExchange form I'm typing this into—it shows up as a "broken image" icon.
  2. GIMP (start, then hit Ctrl+Shift+V to "paste as new image")—shows a loading spinner cursor forever.
  3. Slack, which pops up with "File unsupported ... Sorry, image.png is a type of file not supported by Slack ... Try uploading a .zip version of this file instead."

I've regularly used mate-screenshot for months now in all of these contexts without ever having this happen, until last week some time. And there haven't been any updates lately to the package it comes in. The behavior persists between cold boots.

I'm using Linux Mint 20.3 Una 64-bit. This happens whether I run mate-screenshot plain or with the --area parameter.

Another screen-grab util, Collabshot, still works fine, but I sometimes prefer mate-screenshot. What could have broken it?

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The mystery deepens. After finally writing this up, I tried pressing Alt+PrintScreen (which is a predefined shortcut to take a screenshot of just the active window), and after that, mate-screenshot (from the command line, with or without --area, and from a custom keyboard shortcut defined with --area) worked fine. Even after a cold boot, my custom shortcut continues to work (without first doing an Alt+PrintScreen), producing pasteable screenshots.

TL;DR: somehow a single Alt+PrintScreen keypress fixed this behavior permanently...

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  • Just had this problem happen again—thought it might be related to switching my GPU to performance mode. Still, this fix did the trick!
    – Kev
    Commented Jun 29, 2022 at 6:28
  • Lately I also had to copy said alt+prtscn'd screenshot before it fixed subsequent shots.
    – Kev
    Commented Mar 21, 2023 at 15:03

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