Thread:Support/"Fatal exception of type MWException" as answer for "Special:ManageMessageGroups" page/reply (6)

I mean Firefox keeps waiting for the page to come and meanwhile only shows a white page.

I tried to find out if it was coming from my configuration, so I installed a clean MW 1.21.2 with the extensions Translate and UniversalLanguageSelector (Both Version MLEB 2013.10), and the problem doesn't come up again.

Maybe I could reset the stats by suppressing all translated pages (only 2 for the moment) ?

Or is there a better way ?