I opened one of my decks to change out some cards. While I was browsing the cards I decided to go get something to eat. I went away for about 30 minutes. When I came back, the deck was still open, and I could still see all the cards that were in the deck (at the right side), but it said 0/30 cards.
When I cancelled back to my collection, it also said 0/30 and the deck was completely empty.
The deck was finished and saved before I tried to edit it. I had played multiple games with it. When I opened the deck to swap out some cards, I didn't actually swap any of them out, nothing was changed. So basicly I just opened one of my existing decks, went away for 30 minutes, and when I came back, my deck was just gone...
Any of you had the same problem? And a fair warning to all: If you don't have something like hsreplay on your pc, and you don't want to lose your deck (if you don't know all the cards by heart). Don't go into the deck editor and leave it open for a while..