A graphics support engineer may chime in.
Because you suspect a Catalyst issue, here's where to go.
If you have a driver compatibility or hardware issue, please head over tosupport.amd.com or the visit the AMD Support & Games Forums.
The specific thread for catalyst driver support is located at: AMD Support and Game Forums - Desktop Catalyst Drivers and Software.
If you have a reproducible case, you can file a defect report at www.amd.com/report.