I was giving the clause search a go today and noticed that when I choose Lexham Hebrew Bible as the search version and search for a Hebrew lemma, the box turns red and does not let me search. The search string I was trying runs as follows:
"subject:Abraham verb-lemma:דבר"
To make things even stranger: After closing the search window and reopening it, typing after "verb-lemma:" will bring up Greek lemmata occasionally, not Hebrew ones. But I do not see this with any consistency.

Running 5.0b SR1
I posted this first on the Mac-Forum, but they directed me here, so if you can help I would appreciate that.