Just installed Elements 10 trial on a Mac & it won't open in the dock. Failed at the very first fence. Automatic graphics choice does not exist in my "Energy Saver" system preferences as discussed on another installation thread elsewhere.
Which elements are you using? Photoshop or Premiere? Which version of Mac OS are you using? Are you receiving an installation error or was Elements already working successfully on your computer previously?
Photoshop OSX 10.6 snow leopard. Nothing untoward about installation. Dragged PS icon into dock, white dot below lit up when I clicked it for a moment or two then disappeared & refused to open.
Moving this discussion to the Photoshop Elements forum. The users in this forum should be able to assist with troubleshooting steps relevant to Photoshop Elements launch errors.