[Plugin: Regenerate Thumbnails] Since WP 3.4.2 I am having problems with insufficient rights

Hello Viper007Bond.

Thank you for the great Plugin, it did quite help me a lot in my recent project. Unfortunately the plugin refuses to work since I updated my WP to 3.4.2

The following is happening:
– I choose an image out of my media library and click on “regenerate Thumbnails”
– the plugin tries to access tools.php: wp-admin/tools.php?page=regenerate-thumbnails&goback=1&ids=3422&_wpnonce=62a12a7254
– But instead of regenerating the images, it leads me to a blank page on which WP states that I don’t have the permissions to access this page.

I am the admin and havn’t chanced any of the capabilities.
Is this a known problem? Or is there anything wrong with my setup?

Regards
rob

https://www.ads-software.com/extend/plugins/regenerate-thumbnails/