I'm running the March 21 snapshot of craftbukkit with iChat, permissions (phoenix), worldguard, worldedit, timeshift, runecraft, essentials, essentialsChat, and essentialsSpawn. I noticed (and also awhile ago with my Vanilla server running SimpleServer RC7 wrapper (nothing else) that this happened. I cannot build or destroy blocks in some chunks of the map! It will destroy it, not drop anything, then reappear seconds later. When placing a block, it places for a split second, then disappears back to my inventory. I found the edge of the chunks I can't build on, but it's rather annoying... Is this just a minecraft glitch or something I'm doing wrong?