After upgrading to WP 3.4.2 I can't install or delete plugins and themes. In the administrator menu in the dashboard install and delete aren't displayed.
If I link directly to ../wp-admin/plugin-install.php I get the message that I don't have the rights to see this page.
I had a look in the net to solve the problem - but I didn't found a solution:
1. checked the rights of folders and files - ok
2. checked the prefixes in the database - didn't change anything - ok
3. deleted unused plugins
4. added a new administrator account - same problem - no install/delete menu for plugins and themes
Any help? Thanks.