I'm back after an year and... lots of things have changed. Anyone care to fill me in about what happened?
Well currently /sell isnt available. Its still there but there was a big exploit that is currently being fixed, so its still there, just not currently. If that was your big thing for saying what happened
In addition to what @Mission001 and @steveshizzle said, among the 3 biggest things to be aware of, [Trade] signs are broken as well. Until further notice, you should NEVER withdraw stuff from a sign of yours if your inventory doesn't have enough space to accommodate that: if you do, and your offhand is empty, it will behave as a blackhole and suck all the stuff in excess. Do that with sea lanterns and cry a lot. I think the same happens with kits and in general with any plugin that adds stuff to your inventory; but I'm not sure.