Yo, thanks for the information so far, guys. I'm not certain what exactly is the issue with OSX, but I know I have observed it before on another Mac, so it's at least consistent. I'll have to look into it a bit more - maybe work on the internal profiler so I can get some info from testers. Thanks for being patient!
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No problem. I would bet that more shaders have the same issues though, so try finding a pedantic shader compiler and fixing everywhere with unlike types. C and all it's derivatives (GLSL) are very strongly typed.
UPDATE: I can't seem to find the diffs right now but I had to edit the bgblur, blur, and crepescular ray 2d shaders.