I think that there is a problem with the forum's search function.
For example, I can go into the "Archived thread for old site" section, search "UFO" and "No posts were found because the word ufo is not contained in any post." comes up. There should some results because "UFO" is in the title and contents of the first topic shown. I can search "cube" in "General Rubik's Discussion" though and 136 matches are given.
I think this needs to be fixed.