We are having occasional problems with slide advancement with Proclaim on Mac Pro with 10.8.5. Song Slides aren't advancing when using the right arrow and sometimes clicking with mouse. I noticed this morning when the mouse cursor is in the bottom slide preview strip the right arrow on the keyboard will not advance the slide. Is this a glitch or is part of the software design? Checked a Windows 7 laptop and it seems to be advancing with the right arrow on keyboard no matter where mouse cursor is.