Medialibrary empty after activation

Hi there,

After updating the plugin I found an odd behaviour. The medialibrary is empty. When I’m deactivating the plugin, all returns back to normal and the medialibrary is working correctly. It seems there is a bug within the plugin, which kills the functions for the medialibrary.

Tested and reproduced in WordPress 3.5.2, 3.6, 3.6.1 on several installations.

Steps to reproduce:
Activate the plugin
Enable the widget
Do some searches in frontend
Have a look into your medialibrary in backend (empty)
Deactivate the plugin
Hava a look again in your medialibrary (all fine)
Activate the plugin
Medialibrary empty
Ando so on ….

http://wordpress.org/plugins/multiple-category-selection-widget/