Ok this is the second mixer I've had since starting to build my in home studio and its the second one to lose a whole left or ride side main mix! The first was a Be@$#%ger, and now my Mackie 1620 w/firewire has done it to me. The main L xlr out to my powered monitors stopped working on me as I was closing one project to open another in SONAR. At first I could hit the button to go to phones and I could hear both sides in them, now I cant even get a level on my left side with those! If I just record a test track with a mic I get great ingoing levels on both the left and right meter, but as soon as I go to Playback the track it only comes out on the right side and the level on the meter for the left side will only go up to like -25...!!! Could i be screwing these mixers up, or is it possible that I just got two bogus mixers in a row? I've called Mackie (excellent support BTW) and they are sending me a brand new one and paying for the shipping both ways.