Can't reorder items in Text formats On Drupal 7.15, I cannot save reordered draggable items at /admin/config/content/formats.
That is the dialog with all text formats and their options, and dragging them in order force their order of appearace. 

I am able to drag items and reorder them, but after saving, items returns in previous order, in spite Drupal says "The text format ordering has been saved."

I do not have clue yet how to troubleshoot this issue, as there is no error anywhere.
This was very strange issue, now solved, but can't texactly the point that solved it, as i ran extensive code/config sweep both on code / server side. (Including Apache restarts, MySQL restarts, module maintance (many unused gone with the wind), APC configs, and running registry rebuids.