Four days ago I found the solution and posted in steam group for SweetFX.
Solution for: SweetFX 1.5 Fix for RadeonPro Compatibility
Main.h replaces the file in your (SweetFX/Shaders) folder
Code Changes The following minor change in code fixed it.
This has allowed me to use RadeonPro with sweetfx 1.5.
I heard this fix has been discovered before but personally I figured it out myself.
Steps I did:
1) Replaced each file in main folder until it has a effect (no effect at all)
2) Replaced the subfolder (sweetfx had a effect)
3) Replaced with each folder within sweetfx (only shaders had a effect)
4) Replaced vibrance (had no effect)
5) Replaced top half ( had no effect) then bottom half (had a effect)(
6) Spotted main.h (compared to main.h of sweetfx 1.4 and noticed a change in the script and deleted
the sweetfx_ part)
7) Worked
Steam Group Original Post: http://steamcommunity.com/groups/SweetFX/discussions/0/616189106403430938/