Have had 2 occasions thus far of items disappearing from violet backpack;
- Logged out normally with near full violet backpack; items included books taking up the top two rows, various other items below. On login, only the top row and one book in the bottom row remained.
- While running, same books in top rows, game crashed to desktop. On login only the top row and one book in the bottom row remained; again all other items disappeared.
This was while playing hardcore mode (server 0-2) on experimental server.