forge 1.7.10 crashes on world launch

[zerog20021]

title is fairly self explanatory, every time i launch a world, the game crashes and says this: 

The game crashed whilst unexpected error
Error: java.lang.IndexOutOfBoundsException

i've tried launching an existing world, making a new one, both with and without any mods. in short, ive established its not an issue with mods, ive reinstalled forge, anybody have any idea as to what the problem could be?

[MDW01]

1.7.10 is no longer supported on this forum update to receive support.