I was working on some test renders, and things were going ok.
two hours later, setting up another scene I went to render,
as i tried to change the Frame/Animation Ext choice from the default "name.ext [single frame]" to "name.#.ext", i got an error:
// Error: The attribute 'defaultRenderGlobals.animation' is locked or connected and cannot be modified. //
I've tried closing and re-opening maya.
Going back to the scene i had already rendered out ok, i found i had the same problem if i tried to change it there too.
I opened a new scene and i can make the change to name.#.ext there, but i'd like to fix/repair the problem that causes this so i dont' have to lose any more work.