First of all I'm really digging X3b.  I was using BiFilter2 on several tracks, perhaps 7 or 8.  Suddenly the effects were not registering thru the plugin.  In other words, I could move the knobs but there was no effect. First I thought I had bypassed the plugin but then I notice the same problem occurred on all the tracks.  Couldn't figure it out so I closed and reopened the song and it started to work.  Tried to recreate the problem but never did. In my opinion, I think this will eventually become, the best version of Cakewalk EVER!  No crashes so far and I love the colors.