SQL Developer backspace/delete not working

We regularly working on sql developer without  any issues, suddenly we got an issue with sql developer backupsace button and delete button is now working,.

We restarted the sql developer and tried its same issue.

Becuase of this issue  no need to unistall / reinstall sqldeveloper,

To resolve the problem you have to go to:

Sql  Developer (old version) 

 Tools -> Preferences -> Accelerators -> Load Preset -> Default -> OK

Sql Developer(New version 3.2):

Open sqldeveloper -> Tools - > Preferences - > Shortcut Keys -> More Actions -> Load keyboard schema -> Default - > OK.

Now its working well.

Best Regards.