Just FYI, I tried many times to deal with the messed up captcha setup on the registration page, finally resorting to using IE, which on the second attempt finally worked. The letters I was supposed to type were mangled so that only 3 or 4 of the 5 were appearing, with superfluous text in between them (the text saying “Type the letters shown” appeared duplicated). In other words, I could not see the full captcha letters.
Firefox 2.0 always duplicated; IE 7 like I say on second attempt to load letters displayed all 5.