Have you tried clearing browser cache and cookies (make sure that Google cookies are not preserved)?

Does the same thing happen in a different browser, or on a different computer?

Which browser, browser version and operating system are you using?
If you’re not sure, click this link to find out: http://www.thismachine.info/
and include the info in your reply.

Have you tried restoring a previous backup of your iGoogle page in iGoogle Settings?