Dydric,
I had this problem and I fixed it. Look here.
SteveAgl,
I too had the problem with plugins not activating. See comment #36 above.
I had an issue with my installation that I could not activate any plugins. The page would display the text “Plugin activated” even though it was not. I was able to fix it with a minor change to the plugins.php file. Please look here. Basically I needed to add an exit command after the header(’Location: XXX’); commands. Don’t know why this was not a problem in the past but it was screwing me up.
Ahhhhh! Installed wordpress 2.0 and everything looked fine. Went to reactive plugins and they ALL fail. I don’t mean they are not compatible. I click the activate link and the browser reports “Plugin Activatedâ€?… but it is flat out lying. No matter what I do no plugins are not activated. Even Akismet plugin supplied with WP 2.0 doesn’t activate. HELP?!