Hard to say without any information… Did you maybe pull it in the track below?
We need more details to help - our crystall ball is being repaired 
As unsatisfactory as this answer will be, this is a known problem that randomly happens after awhile due to a bug in Qt Framework. It isn’t something that can be fixed in Shotcut code. The timeline toolbar icons still work and keyboard shortcuts still work. Drag and drop should start working again if Shotcut is restarted.
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thank you
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