If its a bug in this version of the script, there are "workarounds". Before your message displays where a parallel event is expected to run, try running a couple Script calls:
$game_map.event[41].refresh
$game_
map.events[41].start
Calling "start" can force an event to start executing, even if the event is set to "Action Button".
Still worth while to find out why a Parallel wont run for you. Is the parallel event on the screen viewable by the player? Not just on the same map, but visible to the player (if it had a graphic)? Bug may also be coming from some form of Framerate Optimizer...