Congrats, everyone at VSL seem to have run into the same issue regarding the loopbrowser stalling Logic on startup.
To solve it, please remove the files "bomread" and "LogicLoopBrowser" from the Logic 9.app/Contents/Frameworks/LogicLoopBrowser.framework. Then restart Logic. Then put these files back again. No idea what is going on there, but since we've seen at least 3 issues of this internally, looks to be a major issue.