Note that this won't change your CCC Unix password -- that is untouched. Sourceforge has a flaw that, under rare circumstances, prevents students from accessing the source code files from within Eclipse even though you have access as shown by logging in to sourceforge.
Here's what you need to do. You need to change your password WITHIN SOURCEFORGE. Then log out and then log back in again.
To keep things sane from your end, you might want to change your password to some temporary password, log out, then log back in again and change the password back to your official CCC unix password (unless you relish the idea of remembering multiple passwords!). Here are the instructions from sourceforge.