Why does the iTunes Store (iTunes 11.2) keep asking for my Apple ID password on launch?

Question

iTunes 11.2, Mac OS X Mavericks 10.9.3
The iTunes Store keeps asking for Apple ID password on launch, and with every download, even when I am already logged in to the iTunes Store with my Apple ID. I am using iCloud, my iCloud account is set up on my iMac and I am using iCloud Keychain. My Apple ID password is stored in my Keychain. So why can't the iTunes Store remember me?

Answer 1

Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Select the login keychain from the list on the left side of the Keychain Access window. If your default keychain has a different name, select that.
If the lock icon in the top left corner of the window shows that the keychain is locked, click to unlock it. You'll be prompted for the keychain password, which is the same as your login password, unless you've changed it.
Right-click or control-click the login entry in the list. From the menu that pops up, select Change Settings for Keychain "login". In the sheet that opens, uncheck both boxes, if not already unchecked.
From the menu bar, select
Keychain Access ▹ Preferences ▹ First Aid
If the box marked Keep login keychain unlocked is not checked, check it.
Select
Keychain Access ▹ Keychain First Aid
from the menu bar and repair the keychain. Quit Keychain Access.