Hey Robert,
I started having the same issue with my Mac Mini after updating to Mainstage 3.3 last month. Starting Mainstage with a monitor connected to the mini Displayport works fine. Starting Mainstage with just the USB DisplayLink monitor connected (MB168B) causes the "quit unexepectedly" error. I updated to the latest DisplayLink driver which did not fix it.
This was not the case when I was running Mainstage 3.2.4, which started up fine with just the MB168B plugged in. I reverted back to 3.2.4 (I luckily had a back up) and Mainstage again starts with no problem.
Not sure what could have happened with Mainstage in the update to 3.3, but that seems to be the issue.
-Matt
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