i don't have a clue either, but 24 hours ago there's have a direwolf20 modpack 1.6.4 version 1.0.11 show up on ftb lunacher, and 1.0.10 version was disappeared for no reason, NO twitter logs saying there's have a 1.0.11 push to server from anybody. and the 1.0.11 packs cannot be download due to server error. After about 3-4 hours this error is fixed and 1.0.10 version comes out again.
i don't think this is the root cause of your problem but maybe you can change your version number of packs or download server and see what happen?