Boot Camp Windows drivers and OSX drivers (even when attained from AMD site, they are only hosted here convenience) on AMD products are directly supported by APPLE. Official Apple Support
Now that being said I have not seen anyone with this issue. I am sure if someone comes along that does they will reply.
Just want to make sure you are asking for support from the only official place you can get it. Unfortunately they don't support the boot camp side well as frankly they don't care about Windows. They should at least be able to address the in OSX issue.
I should ad these forums are USER TO USER SUPPORT NOT AMD TO USER. To report an issue to AMD your can submit a bug report here: AMD Issue Reporting Form