Strange, have had that transform or a very similar one to that for a while with no issues. You on the 4.x train of code? Could try:
Febreeze the zeneventd.log to verify no code problems
A simple transform like evt.summary == 'Hitting transform" to verify the transform is getting hit.
Maybe continue with a similar transform the link above, but insert evt.summary == evt.component + evt.device in various points of the code to see what is and isn't getting executed.
--Rob