Problem: following the installation instructions for 7H results in this error on game load: "Postprocessing initialization failed, check APP.LOG for more information."
Solution: in ff7_opengl.cfg, change the line
# post-processing shader, used to apply fullscreen effects
post_source = shaders/ATI_SmartBloomAdvanced/SmartBloomAdvanced.post
enable_postprocessing = yes
to
# post-processing shader, used to apply fullscreen effects
post_source = shaders/SmartBloomAdvanced.post
enable_postprocessing = yes
or analogous for your selected shader.