The FTB Forum is now read-only, and is here as an archive.
To participate in our community discussions, please join our Discord! https://ftb.team/discord
That's what I did... it seems to be the problem with the jarfile launcher.
In that case, Waele, update manually, replacing the launcher file with the new one from the website.
Strangely, I'm having the same problem. Are you using the .jar version of the launcher?
Edit: I tried to manually update, and same issue. Perhaps the jar version is not yet updated.