I'm curious whether anyone else has encountered and resolved this issue? I have experienced similar symptoms to those described by [boltongenes] recently, possibly only since updating to version 220.127.116.11. It only seems to occur when editing an existing citation. Sometimes it's only a visible disappearance of the cursor within an editable field, and the citation can be closed and re-opened and life continues. Other times, the citation dialog box cannot be closed, and a software restart is required via ctrl-alt-del.
I deleted and fully reinstalled RM7 from a fresh download of the installation package, and the behaviour persists. I do not have webhints running; and all files are local to my machine without any external synch.