Just updated my MacBook Pro to 10.9 Mavericks and tonight when I started OpenLP for our Tuesday night church service I noticed that the new 10.9 feature which puts the menu bar on all screens put one on the OpenLP live screen. It should be noted that I am just now downloading the 2.0.3 update(the one I used tonight was 2.0.2), though I didn't see anything in the change log about a fix. Anyway hopefully the developers can get this fixed soon but in the mean time it would be wise to avoid the 10.9 update(though it is a very nice update) unless you don't mind a menu bar on the Live screen.
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Tommy