Steps to reproduce the issue

Create a menu item with category list, chose a category other than uncategorized.
In frontend edit create "New" to create an article in that category, some text and save.

Expected result

Ths article should be same saved in the chosen category (the one the menu item points).

Actual result

Ths article is not saved in the chosen category.

System information (as much as possible)

Joomla 3.3.6
Default template

Additional comments

Also there seems to be similiar problems with the languague combobox too (try in a multilangue setup).