Beside posting this message, Brad had also contacted us via email. Xeams has an embedded relational database that is used for reporting purposes. This DB is stored in $INSTALL_DIR\db folder. There were quite a few error messages in Xeams.log related to this problem. We stopped Xeams, renamed the $INSTALL_DIR\db folder to something else and restarted Xeams to fix the problem. 

Note that Xeams recreates $INSTALL_DIR\db folder if it's missing.