When selecting shift delete files located in the user\temp folder, and a file is locked by the system Dopus fails to delete the unlocked files and then stops responding. If only delete files is selected then Dopus deletes unlocked files notifies of locked file and then will close. This began with the lates beta version 10.2.0.2. Maybe a bug?
We'll put out a new beta soon that fixes it.
(See 10.2.0.2 beta: Can't skip or abort deleting a locked file for an earlier thread about the same thing.)