There might be a bug with handling virtual screens on Macosx.
Or maybe on the loading of assets?
Check this thread here:
http://www.glbasic.com/forum/index.php?topic=9835.0
Download the second project: OSX_test.zip (2525.88 kB)
Things fail to show up on a Mac(intel or uni) correctly, but on older GLB versions, it was handled fine.
Note that if you leave only one LOADSPRITE things work fine, multiple image loading cause problems, be it sprite/bmp/fonts.
No problem with sound files.
It works fine on PC, Caanoo, Android.
Might be a good thing to try Linux, IOS, Pandora and the other platforms just in case, but here I don´t have them.