Latest drivers as of today on Win7 64bit. After I pause from GPuPerfStudio then any action to profile/frame-capture etc will crash my program. It looks like its because it fails to map a buffer when running under PerfStudio as I can see some error about failing to map a buffer in the console window for the PerfStudio server.
GL4.5 program using glMapNamedBuffer() etc.
A new version of GPU PerfStudio has been released with RX480 support, available here: http://developer.amd.com/tools-and-sdks/graphics-development/gpu-perfstudio/ . Let us know if you're still seeing issues.