And I've tried disabling all plugins and using the Twenty Eleven theme. In our sites network, I'm the network admin, so it's not a permissions issue. Any explanation or ways I might be able to approach debugging this?
I apologize for the original lack of detail; I was in a rush to a meeting.
By "not working", I mean specifically:
On none of my network sites do I see 3 of the 4 insertion icons you would usually see at the top of the post/page editors. The one that looks like a starburst (Media Insert) is there, but literally does nothing when you click it.
Images from previous articles that have been embedded: If you click them, you still get the edit and remove buttons overlaying them. But clicking the edit button only serves to bring up the darkened screen overlay, and no media wizard.
This only happened after our upgrade to 3.2.1 from 3.0
We can upload media through the media area of the admin backend, but only through that area.
I hope this helps paint a better picture of what's happening.
Cracked open the Chrome debugger on that window, and I'm getting this error: may be related.
Edit-Note: (From a comment to an answer below) "I guess maybe I used the wrong verbiage, but in the post, I was trying to convey that I had already tried fixing by disabling all plugins. No avail."