The Bloom compositor simply does nothing.
The follow compositors result in a single-colored screen output:
Bloom, Glass, B&W, Embossed, Radial Blur, Motion Blur
I set this as major as it may hint to a more general problem. Maybe it is not, though
Windows 7 64-bit, GeForce 580 GTX, Compiled with MinGW GCC 4.7.1