DeviceLock Management Console and Service Settings Editor crash when an attempt to edit settings when there are 3000+ items in USB Devices White List is made.
This is a known issue fixed since DeviceLock 6.3.18503.
1. A workaround: use DeviceLock Enterprise Manager to edit a white list. Save it to a file of .whl format
2. The resolution: upgrade to the latest version of DeviceLock (at least, to 6.3.18503).