Can't log out of many sites
Safari is becoming increasingly problematic at logging out of sites that have cookies. To name just two, Twitter and Google Reader. When I click either web site's sign out button, the next page that appears is me still logged in. No matter how many times I click log out, it won't log me out.
Tried the exact same thing in Google Chrome, and no problems -- I'm logged out properly.
Any fixes to Safari becoming so inconsistent at this? I know I can dump all my cookies, but I'd prefer not to do that because of lots of useful cookies that exist. (And I don't want to have to manually delete Twitter or GR cookies every time I need to log out.)
Mac Pro 8-core (2 x 2.8), Mac OS X (10.6.3)