Go to the hexxit server files, and in there you should fine a file called 'launch' (it is a Batch file) right click it, click edit, then type it in in place of the "xms----" stuff
Title: Broken Ladders
Version: 1_0_4
OS: Windows 7 Home Premium
Java Version: 32-bit
Description of Problem:
I cannot climb ladders, both on my server and in single player. This has been happening since I installed optifine, though I really can't play without it.
Error Messages:
none
Error Log:
none