It seems like there has been a major rollback of the player data on FTB.mcnsa.com.
My character now has none of the thaumcraft research where 4 hours ago I had just finished my second ichor research item.
And my character had only the most basic inventory, including just his first Ars Magic spell. Ars spell book, powersuit, thamcraft wands and focus’s gone.
It looks like more than a month was rewound on my character.