I have actually the same/similar problem after the latest update.
I have to deactivate AllinOne plugin whenever I have to:
insert a picture into a post
put a link into the text
open plugins windows in the post or wordpress windows.
When i deactive the plugin then everything works, and I have actually tried deactivating all plugins except this the All in one seo without luck.
So far I have only tested on two wordpress blogs which both run an eleganttheme but two different themes though.
