um I cannot fit in 1 block tall spaces as mobs that are one block tall anymore and I have the morph mod version 0.9.3. and iChunUtil version 4.2.3.

Nevermind it turned out it was because of my armor my bad

Usually a mod conflict, see #796

Nothing has changed since I was last able to squeeze into a 1 block tall space, I just stopped being able to I didn't add, remove or update any mods. When I am a mod that is taller than two blocks, I am unable to go through two blocks like i am supposed to, but I am unable to fit in 1 block tall spaces as mobs such as bats like i am supposed to, and I am not forced to go diagonally I stay vertical, I NEED this to be sorted out because I am a perfectionist, it just suddenly stopped working in 1.7.10, I know it is NOT a conflict because one minute I was mining in a 1 block tall and the next while i was mining all of the sudden I began to suffocate, and I made sure dropped down as far as possible but I was still suffocating and on my screen was a stone block as if it registered me being stuck, I managed to switch to creative in time.