Technic not executing modpacks.

[mcmacker4]

A friend of mine told me that he had a Hexxit setver so I asked to join.

So.. I downloaded the launcher and started downloading Hexxit pack. When the modpack was finally downloaded it executed and the ForgeML loading screen appeared. Everything cool, right? Well... No. When the FML screen disappeared saying it had validated minecraft everything disappeared and nothing else happened. I tried again, tried to re-download the pack, tried with Tekkit... Everything was the same.

I'm using a Mac 10.8.4 (if that is important to know...)

Any ideas why this is happening?

[Munaus]

Try this link.