Guild Wars 2

Can I suggest you try deleting the Guild Wars 2 folder that is located within the User Library under Application Support.
This will purge the launcher files and force the game to redownload them on start up (a small download, like 8MB or something).
That might fix the issue of the launcher updating every time you start the game up.

FlamingFoxx’s solution fixes virtually any mac client issue. +1

Thanks for the hint, sadly it did not work for me (deleting the Guild Wars 2 Folder).
Its still updating every time..