iGigBook Sheet Music Manager App for iPad and Android Tablets
We received the PDF and have confirmed what you have reported. Somehow in your PDF the rotation is set for 360 degrees which is more than likely responsible for this behavior. This is the first time we've encountered this since the app was made available in 2010. We should have an update available shortly.
iGigBook has been updated to version 5.8.4 which fixes this problem.