Okay so I've been having this error for a few days now and I'm beginning to get very frustrated..
Whenever I try to join my server, everything at first is fine. However after about 45 seconds I will disconnect, receiving no error messages in my servers console. Also, all the mobs/entities/other players are completely frozen in place, and only a 5-6 chunk radius is loading. I cannot run any commands or chat either. It seems to be completely client side, because none of the other players are receiving this error.

I checked my client console and the only thing I pulled from it was this:

[18:03:54 INFO]: Client> [18:03] [Sound Library Loader/INFO]: Sound engine started
[18:03:57 INFO]: Client> [18:03] [Client thread/INFO]: Created: 1024x512 textures/blocks-atlas
[18:03:58 INFO]: Client> [18:03] [Client thread/INFO]: Created: 512x512 textures/items-atlas
[18:03:58 INFO]: Client> [18:03] [Client thread/ERROR]: ########## GL ERROR ##########
[18:03:58 INFO]: Client> [18:03] [Client thread/ERROR]: @ Post startup
[18:03:58 INFO]: Client> [18:03] [Client thread/ERROR]: 1281: Invalid value
[18:03:58 INFO]: Client> [18:03] [Client thread/ERROR]: ########## GL ERROR ##########
[18:03:58 INFO]: Client> [18:03] [Client thread/ERROR]: @ Pre render
[18:03:58 INFO]: Client> [18:03] [Client thread/ERROR]: 1281: Invalid value

Usually I can resolve issue's like this on my own, however I can't seem to figure this one out.
Someone please help me, I've spent hours trying to resolve this problem.
Nothing similar on Google seems to be working. I've tried deleting Forge, SPC,
removing my resource packs, and even a full re-installation of Minecraft.
What's strange is that this is ONLY happening on my server. Single player works just fine, and so do other multiplayer servers.

Java Version:
"1.6.0_65"
64-Bit

Computer Specs:
Macintosh 2008
OS X 10.9.4
Mac Pro

Any help at all is highly appreciated!!