Have you moved or renamed Photoshop CC installation folder? Did you install PS CC in the default location or removable drive? Please check "/Applications/Adobe Photoshop CC/Adobe Photoshop CC.app/Contents/Resources/AMT/application.xml" to see whether one or more path in it is incorrect.
For the slow loading issue, please update Extension Manager CC to the latest version (7.1.1) firstly. Then startup it. Click "Tools"->"Preferences" menu item in Extension Manager, check "Enable detailed logging" option. Restart Extension Manager. When it finishes loading or hangs, send all files in "/Users/<YourUserName>/Library/Application Support/Adobe/Extension Manager CC/Log" to email@example.com.
Note: The Users Library user folder is hidden on starting with 10.7 or later
Hey thanks for the reply and sorry about my delay about your answer, everything works fine.
I had the same issue on my Macbook (this one was on a new iMac), but restarting the computer made it work somehow, I think it could be a comon fix to this issue.