Along with the default mods installed in the pack, I have installed Mo' creatures, Balkons weapon mod, Gregtech, Damage Indicators, Advanced Solars, Advanced Machines and Optifine Ultra D5. Current version is 1.4.7.
It seemed like it was an Optifine issue, as it ws a GL render error, so I removed that, but it didn't seem to help.
I can try removing some of the mods, but I have already removed the ones that aren't being actively used, but to no avail.
Does anyone have an idea to what could be happening here?