Inspect the page_load "sender" object in quickwatch and see if the button is missing.
Also, check the viewstate of the page.
Another probable reason could be validation request. As you gave choose culture french, there could be a possibility of having characters that are recognized as potential dangerous to restrict cross scripting attack.
Hope this helps.
"We know accurately only when we know little. With knowledge, doubt increases.”
Last Visit: 31-Dec-99 18:00 Last Update: 28-Aug-16 5:17