I have the problem with one of my sites that I cannot upgrade any of my plugins via the plugins management page.
The top 'Update Available' menu link is missing even though some plugins are older versions that need upgrading, and no 'There is a new version of ...' messages are showing for any of the plugins.
the plugins definitely have upgrades available for my version of WordPress 3.2.1, and I am logged in with full admin rights.
Has anyone else seen this behaviour / can suggest a solution?!