No Media Manager in 2.5

I upgraded to version 2.5, and I can’t seem to enable the link to the media manager. It should be under Manage -> Media Library, but if you look at this screenshot of my admin you will see that it isn’t available.

Do you have any ideas what the problem could be?

Edit: Looking at the screenshot, I see that there were other plugins running. I deactivated the List Manger plugin, and Media Library popped up! I can only assume that plugin has some sort of issue.

Hopefully this will help someone else who runs into this issue.