I updated my server to 1.4.6-R0.1 yesterday, and noticed that my 2 (sitting) cats were missing. I restored the final backup from 1.4.5-R1.0, and the cats were missing there as well. I downgraded again, back to 1.4.5-R0.2, where the cats were safe and sound. I have been testing since then. I've removed ALL plugins. The cats will eventually disappear after an upgrade to 1.4.5-R1.0 or 1.4.6-R0.1, but they seem (so far) to be safe under 1.4.5-R0.2. I have run Minecraft Region Fixer on the world, both before and after the disappearances, and no problems have been found. I'm testing with no other players on the server, so I know I'm not being griefed. I have 5 dogs sitting far away (more than 128 coordinates in X and Y directions) and nothing ever seems to happen to them. The cats ARE near a portal, in two separate locations both at least 16 coordinates away in X and Z directions. I've never noticed any entities going through the portal (that's been disabled in Bukkit anyway AFAIK). The entire area is safely walled and properly lit. Any ideas? With further testing, it seems that crafting an item, particularly wood block -> wood planks -> sticks, then leaving the sticks on the crafting table, is what makes the cats disappear. Again, they don't disappear on 1.4.5-R0.2, but about half the time I go through the above transformation on a crafting table in 1.4.5-R1.0, some or all of my cats disappear. Still not using any plugins. No messages in the console other than my usual join/connection reset/disconnection messages. EDIT by Moderator: merged posts, please use the edit button instead of double posting.