So it turns out that I epically failed the other day when I didn't bother mining some dark xychorium ore that was hanging out at the bottom of my primary mining ladder. You wouldn't think that a little xychorium would matter.
Yeah, there were 4 diamonds right behind it
I also discovered recently that when you fill up a xycraft tank by putting in cans, you don't get the cans back
And I wonder where I parked my turtle last week...
[edit]
EVEN MORE EPIC FAIL
Okay so my game randomly crashed (it does that on occasion) but this time when I restarted it redownloaded the pack. As it started I checked to make sure my world folder was still where it should be. It was. I went away from my computer for a while and when I came back Minecraft had started (defaulting back to fullscreen mode) and BAM, my world no longer exists. And I was planning to back it up soonish in case something happens to my computer while I'm away camping.
TEAL;DEER
MY FTB WORLD DELETED ITSELF UTTERLY
(edit: note: while my save was deleted, my gregtech config was preserved. BUT it deleted my texture pack.)