Installing and removing plugins work as expected.
Installing theme failed as long as this plugin is activated, and not even used (selected ftp method) with an "file is empty...... " message. When I deactivated this plugin, it worked straight off.
After I installed the theme, I activated this plugin again, and my theme was in need of a bunch of plugins, suggestion to use a bulk-install. This was also broken when trying to use this plugin to login/authenticate.