Q: iTunes 12.3 with el Capitan not responding

I also have this problem, thought it was iCloud permission problems, went into folder and deleted, worked for a while and then just froze again. Cannot access iTunes at all, the only thing that works is to force quit.

Have also tried Safe Boot, and repairing permissions, both to no avail....

Also, on every start up; iTunes takes about 5mins looking for my music folders.

Mac Mini 2012, OS X 10.11

I've started having this issue this evening.

I went to change a tag on a "home video" and it locked up. After a force quit and then a restart of the computer, iTunes will launch but totally unresponsive. I can not click on anything.

I posted a similar problem a short while ago - in my case, only the buttons, etc. associated with my account (login, authorize computer, etc) are non-responsive.  The rest seem to work properly.....

A little update, I've just got home after leaving my Mac on since yesterday and everything seems fine, although iTunes is still very slow looking for my music files.

I installed Capitan and my iTunes won't even open.  The error code (unknown error 42037) suggests that the software may be corrupt and to reinstall. 

Ditto. iTunes inoperable since updating to El Capitan

I just tried googling this issue, and one of the top hits was this thread. Nothing enlightening out there that I could find.

Somebody has got to contact Apple Support and try to get this walked-through to a solution. I can't do it because I'm not having this problem. But if somebody here has got the time, you can initiate a phone call or an online chat via the Apple Support page -- click "Support" above and then choose iTunes and navigate from there. The system may suggest some troubleshooting measures. And if you find a solution, or any information that will be helpful to others, please post it here.

I spent two hours on the phone with the Apple Support and 2nd tier and everyone else..   They have opened a case to identify the issue.

WE ARE NOT ALONE.. lol..    The engineers are supposed to be working on it and I am "going" to receive a call back on Tuesday with an update.

Wendy, thank you! You took a two-hour hit for the team. That phone call will help a lot of people.

Just to update everyone..  I just received a Follow-Up call from Apple,  they are still working on the issue and will let know as soon as there

is some sort of resolution...

Thats great!

But...if they do an update/fix, and you can't log into the app store, how are you gonna fix it?

Has your issue been solved?  I too am having extremely slow apps updating over the past couple of days.

Gail, are you having the same problem as us re downloading app updates?

Appreciate the update Wendy.