My Mac won't recognize my iCloud password. iOS and webapp does.

Question

Hello,
I recently changed my iCloud password, after updateing to Mountain Lion (10.8.2). I wanted to access the "Back to my Mac" feature and I was asked my password. I set up a new one on the web as I had troubles remebering it (or maybe it's the same problem I'm having now...).
Ever since, I couldn't set up my new password on iCloud on my Mac. It works fine on iPhone, iPad (latest iOS 5) and on the webapp but it's impossible to log in on my Mac.
It either says that the password is not valid or I just have the spinning wheel for hours.
Anyone has an idea why and how to make it work again?
PS: I'm using different accounts for iCloud and iTunes.

Answer 1

My sympathies, Loriskumo.
I was finally able to connect from the System Preferences / iCloud panel. The trick was to paste most of my password, then type the remaining characters; then the Submit button was activated. Apparently, the iCloud panel doesn't want the password to be 100% pasted—as long as you type at least one of the characters yourself, you are permitted to submit the login and password combination, and be connected.
After all that, I discovered the iCloud System panel contains nothing about setting security questions! Instead, one must connect to the My Apple ID website, where the password is even stricter—you cannot paste into the password field, but 1Password was able to enter my password into the field. Loriskumo, you might have to manually create an entry in 1Password itself which you can then use on the web page, if you need to get into your security settings, etc.
Hope this helps someone!