gitk run from subdir and "find commit touching paths"

If I run gitk from a subdirectory, and then try to find a
commit touching a path, it doesn't work.  No movement of
cursor on "Next/Prev".

Running from the main project directory makes it work ok --
you can go "Next" or "Prev" finding other commits that
touched the same path.

Is this a known problem?  I couldn't find it in the mailing
list archives.

Thanks,

Sitaram