Dankerdorf

The link you gave me won't work.. Too bad Thanks for such a fast reply though!

Whenever I try to launch a modpack, any modpack, the launcher disappears for .25 secs and opens up again. No errors, just like that. Pastebin : http://pastebin.com/iRD3gPFJ Please, I am desperate and I really want to play these modpacks....

You need to go to Pastebin.com and create a new Pastebin and copy everything that is inside that .log file and put it in the Pastebin and just give us the link. Easy, and BTW I have the same issue and I have no logs anywhere.... Weird...