I just upgraded to 1.5, and whenever I press the 'Update Options' button at the bottom of any of the Options pages, I get a 404 not found message.
For example, what is happening is the page is directed to
And this applies to all of them (options-reading.php, options-writing.php, etc.)
If I manually type the latter of the example above into the address bar after making changes, it updates just fine. Anyone know what is missing that it is not doing this by itself?