Hi everyone
just to let you know I went through the same problem. my solution was as follow carryout all of the steps ie deleting all of the afformentioned files Delete 'com.digidesign.protoolsLE.plist', 'DAE Prefs' (folder), 'DigiSetup.OSX' and 'Pro Tools preferences'.
with the exception of this I replaced the entire digidesign folder in application support with a previously backed up version from time machine and it sorted it out if u have any queries about what I did just mail me
Barry