Every time I create a slide show, it works good. The problem is that when I go to another element of the list and come back, it shows this error several times (see screenshot). I think it shows these errors only for the images I added the last time I modified the slide show, but I'm not sure...
Mac OS X Lion (10.7.3)
MacBook Core 2 Duo Late 2008, 2x2.2GHz, 4GB RAM
OpenSong v2.0 beta (x86), 2011r3