form_state empty on views_ui validate and submit (Fatal error: Call to a member function validate() on a non-object in)

Have trouble debugging the following error:

Fatal error: Call to a member function validate() on a non-object in /home/syu/public_html/modules/views/includes/admin.inc on line 910

This was on the 2.12 version, while on the 2.x-dev is on line 914.
That corresponds to the call to $form_state['view']->validate();

But apparently the whole $form_state['view'] have gone missing and this happens on all my views not only the one i was editing.
Without the $form_state['view'] the save() function will throw a similar error.

This happened inmediately after fixing the issue at http://drupal.org/node/759082#comment-3842226 that was solved with a patch.
Went back to editing and added a display, and the views_ui submitted fine, but then went back to add an argument and the error showed up.

From that point none of my views can be saved nor can add new ones.
The only thing that looks suspicious is that while patching for the first issue the caches were cleared including cache_form.
Also, the save button is not grayed out for views that have not been edited.

As far as i know the only other module that changed that day was views_bulk_operations.
No other modules were changed so no disabling of modules have been tested.
The form module is not installed.

I'd check the usual steps (clean install, revert to backup, export the view or disable modules) but i'd like to ask you if have had a similar problem or know where to start checking for $form_state['view] or any info on changes made to the dec 15 versions.

Thanks