I'm seeing strange behaviour with the Plate Reverb. Instantiated on a stereo aux, when fed by mono tracks I get mono reverb. Send to verb post pan and the reverb panning follows the track. Send from a stereo track and the verb instantly switches to stereo and all mono tracks are suddenly verbed in glorious stereo. As a work around I can ensure that a stereo track with blank audio is routed to the verb but it's a bit of pain - solo a region on a mono track and the verb will switch back to mono.

This on Logic 9.17 64 bit, P&M version 2.0