Dual monitor affects keyboard shortcuts

I am running Opensuse 12.3 (x64) with Gnome 3.6.2 and I have recently acquired an extra monitor. I want to use both monitors at the same time. My graphics card is Radeon HD 6450.

I read somewhere that ATI proprietary drivers give better support for multiple monitors so I've installed them [exactly these: http://geeko.ioda.net/mirror/amd-fgl...i-fglrx64.ymp].

Now, using the ATI tool I can set up the configuration of my screens and everything works fine, when I reboot the machine it remembers all the settings so monitor-wise everything works fine.

However, this seems to have affected some keyboard shortcuts. In particular, the multimedia keys (volume, play/pause), the screenshot button and some of my custom shortcuts stopped working... If I go into Gnome's keyboard settings editor I can set all these shortcuts again and it registers when I press e.g. the screenshot button. However, when I actually press the screenshot button outside of the editor nothing happens...

What is even weirder is that if I boot the system with just one monitor the shortcuts start working again... And if I plug in the second monitor while the system is already they keep on working... The problem only occurs if I boot the system with two monitors...

Well, I would really appreciate any help...