can’t view wp-admin/plugins.php page

Hi,

suddenly I have problems accessing the plugins page in the dashboard.

Other pages work but whenever I click on the link to visit the plugin overview page it asks me for my ftp login data (like when I update plugins).
But after I enter this information I get forwarded to the main page.
And when I want to visit the plugins page the process starts again.

This all happend suddenly after an automatic update without me changing any files beforehand.