Some Tips

I found a crashing bug that persisted until I installed Java 7.

Here's what you can do to try this fix (success is not guaranteed, these are beta mods to a beta game) :

go to "October 14 Portable Client for Bricks", the folder I had you download as a zip file.

enter the folder, enter the folder mcp_data, and delete the folder named "java".

Now, go to this address : http://www.oracle.com/technetwork/java/javase/downloads/jre-7u1-download-513652.html

and download the file named  jre-7u1-windows-i586.exe .  It is labeled as "windows x86 offline installer"

Run the installer, etc, etc.

It worked for me, and it also fixed framerate issues that I was having.  I haven't crashed since.