Okay, I've been bad - not reporting this bug earlier ... but for the life of me, I can't find any pattern in when it happens to help you recreate it. I'll be working along in Verbum when suddenly a command takes forever to respond - there is no indexing, sometimes I suspect syncing. When it finally does respond, if it was opening a new pane or popup - it appears outside the Verbum workarea ... most often at the upper left of my screen.

VerbumIndexer.zip
Windows 10