Version 0.2.945, Forge 1448
http://pastebin.com/mpwisxS7

I'm having the same issue on Ubuntu 14.04 x64 using the FTB Horizons Daybreaker pack. Did you get a chance to look into this?

That damn bug won't go away no matter how many times we squash it... >_<
I'll have a look at it, give me a moment...

I was looking through the closed issues to see how I fixed this last time... turns out I didn't fix it :/
Though I think the people who were having issues with it stopped having them... I really don't know, I'll have a more in-depth look at it later today

No longer an issue on newer versions.