Is it possible, that you drove on the Grand-Paris-Moulon map? It dosen't even have to be the last map you drove on in this seesion. I have heard of those problems after driving on this Add-On.
As guest you can only see content in your selected language! Registered users can choose the visibility of other languages in their control panel, more informations here. All topics are marked with a language flag inside the forums: = English [EN], = German [DE], = French [FR].
If you're not able to speak the topic language than write in English!