Hey, perhaps the Mackie forum is describing the same issue you’re having? Check this link: http://www.mackie.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=117598
Everyone described their issue or problem early on and a poster named “The Norm” on 5/12/2011 @ 3:33 PM chimed in and mentioned that he contacted tech support. He provides his results which were favorable on 6/1/2011 @ 8:20 PM and “EDNYKING” followed with another favorable result.
If you have a gig coming up soon you may have to find an alternative if there’s no immediate solution available. Both Norm and ED had to either send speakers off for repair or void warranty by replacing the parts sent to them by Mackie.
Good luck!
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