Deleting the workspace file worked for me as well. Since last Friday I have done 2 repair installations, one premier-only removal-reinstallation, deleted everything and did a full suite re-installation, then opened another account, changed my preferences, moved/tempoarily deleted plug-ins, etc all to no avail. I even created a new account where the program opened (but it’s impractical).
So, it seems it only works under certain conditions, looks like we need more data to determine the conditions under which it works! – Karen