Just tried out the latest release (5.0b SR2) to see whether the original language issue in the clause search function was fixed, and yes, it is! Thank you.
However, I found some mistagged item: I did the following search: subject:God verb-lemma:הלך
The search also hit on Gen 15:2: However, the subject of הלך "to walk" is not God but Abram in this case.
BTW, I find this clause sear really a major step in text analysis, and I hope for a refinement of this feature over the years.