Printf has just entirely failed to do anything

[JBotAlan]

I started with the default camera code from Kevin Watson a few weeks ago, and I have been making my modifications happily--that is, until yesterday. First, I added two of my own files, which did all the camera calls, consolidating them into a single Camera Update function. Then, I pulled the camera update function calls out of user_routines.c and put my camera update function call into Process local IO. I had something like this working last week, but it refuses to send any bytes out the serial port now.

Things I have tried:
-tested my serial link. It is good-I can send programs down + read them back with device reader. I also see IFI> when I reset the bot
-tested with another RC. Same problem.
-unplugged camera TTL converter. Same problem
-Added printfs everywhere in my code. None of them work unless I comment out the #include for serial_ports.h (this breaks the camera functionality of course) And none of the printfs produce any output
-Replaced all the files that should never have been modified (serial_ports.c/.h, terminal.c/.h, camera.c/.h are the ones I overwrote with the ones out of Kevin's code). No effect.

I'm bashing my head on the wall right now.....please help!

JBot

PS. I will post the code tonight if you need it. I am using a school machine right now and don't have access to my code right now.