I always save screenshots to disk before use, so can't picture your use case. However, if you try your activity in some other DE you could narrow it down to whether or not XFCE is at fault. IceWM and TDE, where available, are among lighter weight DEs that don't require as much RAM or disk space as higher profile DEs, and shouldn't interfere with your XFCE configs.
Same goes for your DM. If you normally launch from LightDM, GDM or SDDM, try with startx, XDM or TDM instead.
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