This information applies to version(s): 1, 2, 3, 4, 5, 6
If the applications "Raptr / Gaming evolved" and/or "Plays.TV" were installed automatically with the AMD ATI Radeon drivers, then they may be interfering with DXO PhotoLab.
Uninstalling this "bloatware" should resolve the problem. If you need this software, please ask AMD for a compatible upgrade.