If you are using a ProRender Plugin 3ds MAX with your R9 GPU Card then you need to know that all R9 GPU, actually all Non-RX Series cards have been removed from the GPU Compatibility List for all ProRender Plugins.
Most likely what you are suffering from is incompatibility issues with your R9 GPU card and 3ds Max ProRender plugin.
You can open a thread at AMD ProRender 3ds Max Forum from here: 3ds Max
This AMD Thread at 3ds Max Forum explains what I mentioned above: AGAIN - PRORENDER DOESN'T RECOGNIZE GRAPHIC CARD>!>! any help?
There the AMD Manager for the ProRender Project explains that all Non-RX series GPU cards have been removed from the ProRender Plugins Compatibility Lists.