I am pretty sure I used to be able to search any Hebrew Bible for roots or lemmas directly from the search window, but now it only works with the Lexham Hebrew Bible. It works when the search is initiated from the resource window via the context menu, but not when I start with root:h:searchterm or lemma:h:searchterm and select them from the drop-down list.
I do this:

Then pick one and get that:

But if I select LHB:

It's not just BHW that does not work. All Hebrew Bibles aside from LHB that I have tried don't work.
I have similar problems with Greek, though it's less systematic. In the example below you can compare the results from the left (where I put in the lemma from the search window using the drop-down list) with the results on the right (using the context-menu from the resource window):

I'm using 6.1 SR-2 (it was the same with SR-1).