I´m having some trouble with lesson 3. For some reason, the color red does not appear on my screen while in fullscreen mode (I only see black). However, it works perfectly in windowed mode. Any thoughts?

Looks like a possible implementation problem, this thread has a number of replies about this issue:

http://www.gamedev.net/community/forums/topic.asp?topic_id=48690

Thanks for the reply, but that thread only discusses the problem. No solutions are posted. They do mention something about updated drivers. However, that doesn''t really help me much. For the record my screen driver is Matrox Graphics MGA-G200 AGP.

it could be the color resolution you have your desktop set to.
i know from experience with the opengl demos that if my screen isn''t in 16bpp color mode then i will get the right shapes on a screen that is colored by random splotches from hell.it looks more like a high resolution infared heat camera that a oGL demo.
FYI: my graphics card is an ATI Rage Pro Turbo 2x AGP on the w82560en drivers.
Back to the point
try fidling(did i spell it right?) around with your graphics settings and stuff. it may work.

"Those who want it, but can''''t get it, will complain about it.