This is probably not what´s involved with your issue, but is good to know. There´s a difference between mono input stereo reverb and stereo input stereo reverb. If you open a new send on a mono track, Logic creates a new mono bus. Inserting a reverb on this bus will create a mono input reverb. This means that how ever you pan the track, the reverb sound is going to be in the middle of the stereo image. To get at stereo input reverb, you need to change the bus to a stereo bus before inserting a reverb. This probably isn´t the issue in this case, but it´s good to know for anyone who hasn´t figured that out yet.