With the addition of Corona's setFillColor for build 614, the Spriteloq API has been updated to take advantage of this. Unfortunately, build 591 which is the current non-subscriber builds causes a crash because sprites have a setFillColor function, but it crashes the simulator.

If you're a non-subscriber for Corona, the fix for this is to download the Spriteloq API and then open loq_sprite.lua and comment out line 453 to remove the setFillColor call.

This is Noted in the docs here:

http://www.loqheart.com/spriteloq/apidocs/files/loq_sprite-lua.html#SpriteGroup.fillColor