Dimensions sticking around for anchor

[Justmenow]

Title: Dimensions sticking around for anchor

Version: 1_0_3

OS: Windows 7

Java Version: 7

Description of Problem:

I hit F9 to view the area my dimensional anchor is set up to keep loaded, and there are now blue lines marking the area that are always up. They are slowing down my game, causing quite a bit of lag. Anybody know if there's a way to make these go away?

Error Messages:

Error Log:

[Justmenow]

Update: Just closed down the game and it went away. When I click F9 now, they aren't showing up. Anyone else have this happen?