So I got commit access to the SVN, and I can go to the Conflict Terra website at code.google.com/p/conflictterra and upload any changes I make to YMSAI. Howerver, I should be able to use SVN software to commit my changes. however, the SVN software keeps rejecting my username/password when i run svn commit:

Username: rothj1459@gmail.com
Password: **********

Does anyone know why this is? (and whoever manages the SVN repository, can you please check that rothj1459@gmail.com is on the list of commiters?)

You are indeed on there. I think maybe it's the password. It's not requesting your gmail password but one that google will generate.
Edit.

http://code.google.com/p/conflictterra/source/checkout
click the "When prompted, enter your generated googlecode.com password."

kk. I'll try that when I next commit.

Though, I seriously question the wisdom of this "generated password" system.