Maybe it's my lack of Hebrew understanding, but it seems that power lookup doesn't handle Hebrew properly.
In this example, Power Lookup only returned two hits when there were clearly at least 5, if not more, as evidenced by the dictionaries in the menu:

It's even worse when I click on "form", and use Power Lookup on its lemma. Nothing is found at all (yet there are still 5 hits found by the menu):

It doesn't happen for all Hebrew words, though. I can't figure it out.
I'm running the beta, but I posted it in the regular forum since I'm thinking it's not a beta issue.