No Server-List from Master Server???

So i don't know if this is in the right place of the Forum but i hope so.

So my problem is that i played UrT (4.1.1 on a Mac OS X 10.9.4), then i went to eat and when i came back and wantet to go on playing, my UrT says No Server list from Master Server. I changed nothing, and i tried all the solutions that i found on the Internet (Change "master.urbanterror.net" to "master.urbanterror.info" and so on) but it changed nothing, i also tried to reinstall and reset all my settings but i got still this Error-message..

Anyone know how to fix this?

Player3

Normally this should fix your problem...

https://apple.aktiv-forum.com/t327-for-those-who-still-playin-urt-411

let me know if that works or not

Does not work, tried this also..
I read that a lot of players had this Problem and that the solution with the set master server only works in some cases...

Check if Guids is off on your screen

Yes i turned it off, also Punkbuster. Also i turned them on or switched them to "All", every combination, nothing helped..

Hmmm....maybe u just have to delete any config...!?