Playing a world it was kind of laggy hit save and exit. Now I cannot get back into the world its just stays on 'building terrain' then goes back to the home screen. Other world saves work.

2013-03-03 13:44:42 [CLIENT] [INFO] Setting user: hamattack
2013-03-03 13:44:42 [CLIENT] [INFO] LWJGL Version: 2.4.2
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/lava_flow.txt
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/water_flow.txt
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/fire_0.txt
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/fire_1.txt
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/lava.txt
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/portal.txt
2013-03-03 13:44:44 [CLIENT] [INFO] Found animation info for: textures/blocks/water.txt
2013-03-03 13:44:45 [CLIENT] [INFO] Found animation info for: textures/items/clock.txt
2013-03-03 13:44:45 [CLIENT] [INFO] Found animation info for: textures/items/compass.txt
2013-03-03 13:44:45 [CLIENT] [SEVERE] ########## GL ERROR ##########
2013-03-03 13:44:45 [CLIENT] [SEVERE] @ Post startup
2013-03-03 13:44:45 [CLIENT] [SEVERE] 1281: Invalid value
2013-03-03 13:44:45 [CLIENT] [SEVERE] ########## GL ERROR ##########
2013-03-03 13:44:45 [CLIENT] [SEVERE] @ Pre render
2013-03-03 13:44:45 [CLIENT] [SEVERE] 1281: Invalid value
2013-03-03 13:45:03 [CLIENT] [INFO] Stopping!

This error runs until the clients off.

2013-03-03 13:45:03 [SERVER] [SEVERE] Wrong location! qc['Chicken'/2360, l='Swag', x=1052.39, y=76.92, z=482.40]