Same here. What plugins are you using? I'm wondering if it has something to do with the plugin. -edit- Just to elaborate. If you place a coloured block in your inventory and then left click a bit of gravel let's say, coloured cloth reverts back to white. -edit- Also reverts new types of wood into original wood. -edit- Also when you put half step on top of another half step you get 3 half steps. Not sure if that's related.
i am also experiencing this issue, i was building myself a home out of white wood on a dedicated minecraft server, when they installed bukkit, glad for all it can do but now i can not lay a white wood block it automaticaly turns brown right away, my home lays undone till this is fixed D: