4 PHP errors every time I save my views header

I get the error with any (PHP) header I submit.

There's no views 2.x-dev?

I tried the dev version, the view was still in the list, but doesn't work (taxonomy pages look like there's no view active).

(could go back to 2.12 now)

Fuctions are only database queries, string operations, prints and a few times drupal_set_html_head()

But even submitting new content didn't work (just a piece with a few declarations).

It seems like I don't get those errors every time I try to submit (todays attempts are not in my logs)

Does this help?

These are the logs + lines they mention:

1. Parameter 3 to views_ui_build_form_state() expected to be a reference, value given in /sites/all/modules/views/includes/admin.inc on line 1606.
   • $form_state = call_user_func_array('views_ui_build_form_state', $top);
2. call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /includes/form.inc on line 377.
   • $form = call_user_func_array(isset($callback) ? $callback : $form_id, $args);
3. Invalid argument supplied for foreach() in /sites/all/modules/views/includes/admin.inc on line 1542.
   • foreach ($form['args'] as $arg) {
4. Attempt to assign property of non-object in /sites/all/modules/views/includes/admin.inc on line 1613.
   • $object->url = url(views_ui_build_form_url($form_state));

dereine, can you please tell me if I can give any other useful info? I really need this fixed :-/

I disabled several other modules now to see if that changed anything, but it doesn't. I still can't save, but these errors are not in the logs every time I try, not sure what goes wrong when nothing is logged.

I'm a Drupal user for 10 years now (check profile ;)), but I always only used it for a few own (and friends') sites (work = MS stuff), so I could use some advice here :D

I did (#4), but then the view was still in the list, but not working

yes, 5.3.6, I'll see if I can find anything similar here

This issue mentions the same errors, but no solution:
http://drupal.org/node/940664

Ok, but the other one doesn't look very active :-/

I'll have to make a test copy of the site, because it's too delicate testing this on the live one...