I ported "QR Decoder" plugin for C3! See this post:
It's my first ever ported plugin, not sure if everything is done correctly, but it seem to be working fine.
Have been trying to get this to work for hours now....
I am replying for anyone who is having the same problem as me!
Turn off "Use Worker" in advanced inside of CS3
or it will not work.
Best of luck
PS: Thank god i got it working. was about to have to buy a new screen XD