carlospipo
Please define not working properly.
What video card/graphics card does your computer operating system use? NVIDIA GeForce?
Does the problem exist with the antivirus program disabled?
Please delete the Adobe Premiere Elements Prefs file. I believe that the path to it in Mac should be
Libraries/Users/User Name/Library/Application Support/Adobe/Premiere Elements/10.0.
Have you check your permissions, Administrative?
Latest version of QuickTime installed?
After that uninstall, ccleaner run through, and reinstall with antivirus and firewalls disabled.
Please update us on your progress.
Thanks.
ATR