Started after upgrading to 11.4. Downgrading to 11.3 didn't help, nor did making a new Windows user. Symptom is click icon and nothing happens, usually can't kill process. Re-installing quicktime seemed to work for 1 day. Strangely, this works for me.
Open itunes, let it hang like normal.
Open a chat program called Digsby, must trigger some kind of library. Now a blank white itunes window opens and I can't get to my desktop.
Open taskmanager and kill itunes related process (ituneshelper, ipod stuff, distnote, etc).
After that itunes opened almost right away and seems to be "ok"
