MCPatcher seems to glitch Minecraft occasionally for those who play SMP in 1.8.1 like we do.
It was the cause of my server log in problems and I suspect it's the cause of Crispy's as well.
How to uninstall MCPatcher without losing anything:
1. Open your .minecraft folder and copy files you want to keep.
-servers.dat stores your multiplayer server data
-stats folder is self-explanatory
-saves are your single player worlds
-screenshot are self-explanatory
2. Paste those on your desktop
3. Delete the .minecraft folder
4. Start minecraft to redownload
5. Cut/paste desktop files and folders into .minecraft
I would highly recommend only using texture packs that are "standard def" and as such do not use MCPatcher. Avoid anything that says 32x32 or 64x64.
I am currently using the Quandry Pack which offers a "six-in-one" seasons texture array.
The Quandary texture pack for Minecraft