OSX Version 10.9.4. Bought Creative Cloud yesterday as a monthly subscription and downloaded Photoshop, Lightroom and Bridge. Lightroom shows a grey screen and has never worked. Select any option e.g. Library, Develop, Map and get "An error occurred when attempting to change modules". Went to help and re-installed. Now needs a serial number. One not sent with emails. Tried to use the 30-day trial version but still gives the error notice. Have deleted the com.adobe.Lightroom5.plist as one solution suggested.
I have the VERY SAME ISSUE any help out there please