register button grayed out

the register button is grayed out for both dtpro office and dtagent pro
i have tried copy paste close and reopen, what do i do now

Cannot copy and paste documents from Finder to Devon Think Pro Office. Can’t get anything into the database by dragging or copy command. I can get docs in via ScanSnap. No problem if scanned but documents already in other places are blocked. This is a sudden change. Any help appreciated.