Difficulty logging into iWork.com from web browser
Summary
If you are able to log into your iWork.com account from one of your iWork '09 applications but are not able to do so from your web browser, it may be due to uppercase or lowercase letters in your Apple ID.
Products Affected
iWork '09
The password to log into iWork.com via a web browser is case sensitive. A case sensitive password requires you enter your password exactly as it was first entered, including letter capitalization.
For instance, when you activated your AppleID, if your password was "AppleRocks," you would need to enter your password as "AppleRocks" to access iWork.com via your web browser.