This may be a general problem with the new SDL in latest spring. Maybe some combinations of blending and masking do not work on my hardware.
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SDL version: linked 2.0.1; compiled 2.0.1
GL version: 4.4.0
GL vendor: NVIDIA Corporation
GL renderer: GeForce GTX 560 Ti/PCIe/SSE2
GLSL version: 4.40 NVIDIA via Cg compiler
GLEW version: 1.5.8
Video RAM: total 1024MB, available 597MB
Installing OpenGL-DebugMessageHandler
FBO::maxSamples: 32
GL info:
haveARB: 1, haveGLSL: 1, ATI hacks: 0
FBO support: 1, NPOT-texture support: 1, 24bit Z-buffer support: 1
maximum texture size: 16384, compress MIP-map textures: 0
maximum SmoothPointSize: 190, maximum vec4 varying/attributes: 31/16
maximum drawbuffers: 8, maximum recommended indices/vertices: 1048576/1048576
number of UniformBufferBindings: 84 (64kB)
VSync disabled