Seeing this entry repeatedly in the enterprisedashboard.log file:
java.util.prefs - Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.
All supported DevTest releases.
Check what is the hard disk space available in the DevTest Server.
The partition where DevTest is installed and the /tmp partition should not be close to 100% in use.
In Linux systems you can verify the hard disk space using the command: df -h
If permissions issues, please open the permissions on the DEVTEST_HOME folder.