Did you restart blockland?No?Didn't think so.Do it.
flushtexturecache();Type that into console, with the ; and the () and everything.
could this help?http://Blockland.us/driverUpdate/index.html
The whole site changed. Think I gonna contact Blockland Staff.
Your graphics card could be too old/basic for blockland (no offence intended).
Toggle disable vertex buffer objects in the options menu.See if that helps.