Hi there. Brian here. (I help run the RPR project)
I apologize about the confusion. RPR itself (not just the plugin) removed compatibility for R9 Fury cards due to various issues with OpenCL in their driver. This wasn't updated in the device compatibility list, I'll make sure that gets updated.
If you want I can try and find an older build that works with them. You think 2.5 is ok?
Brian