Logged in to the test space on atlassian's open server.

Tried to add a new page with a "?" (question mark) character within the page title.

This character was accepted, but caused major problems on the following screen. Couldn't view the page correctly.

Easy fix would be to filter question marks along with the other already screened characters. (:, @, /, \, &, !, |, #, $, *, ;, ~, [, ], (, ),

{, }

, <, >).