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Do you have any solution for Deselction shortcut, Ctrl D not working
Please post a screenshot of the Select dialog.
Have you checked (Edit > Keyboard Shortcut) if the shortcut has been changed?
What have you done for all-purpose trouble-shooting so far?
Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point: