Your problem is not related to the same issue that Robert is facing. I have a feeling that UserConfig.xml file is corrupted on your end. Xeams makes a backup of the entire config folder for 7 days. Try restoring UserConfig.xml file from /share/MD0_DATA/.qpkg/Xeams/config/archive/*.zip . You will have to get the last good backup.
Once the file is restored, you will have to restart Xeams.
If you run into problems, contact our support via email.