So last night I spent a few hours mining sand on Utopia, I carted it back over to my storage on SMP3, put it into glass, Tallied up how much I had produced for the day (5 DC's) and then logged off - today I log on to find I now only have 1DC of glass and half a DC of blaze rods missing. There's some serious bugs going on with the server at the moment that need to be looked into immediately, either a problem with container perms or chest saving. There's an awful lot of time and effort wasted here and it's pissed me off
smp3 apparently experienced a rollback recently, and a lot of people have lost a lot of items. Aikar is (hopefully) working very hard to prevent this from happening again.