Run Debian Sid (linux for the plebs), and MacOS X 10.4.10, with Firefox 2.0.0.6, Opera 9.2.2, Konqueror 3.5.7, Galeon 2.0.2, Safari 3.0.1, and a slew of other browsers. So far, from what I have seen, the issue effects only Gecko based browsers (Firefox, Seamonkey, etc) and not Webkit based browsers (Safari and Konqueror), IE, or Opera (which despite what a few people stated in one of the other threads here, IS NOT Gecko based). User agent string replacement (which usually helps solve issues like this) does not work, which could mean one of either two things. Either Ratemymelons.com/Ratemypix.com (both are effected, presumably due to sharing a code base), is using a more intelligent user agent detection method and is summarily blocking gecko based browsers (which is stupid, since as of June '07, Firefox accounts for 34% of the Web populace, Mozilla Suite/Seamonkey making up 1.5%, and majority of the 3% of the browsers that are not IE/Firefox/Opera/Safari are Firefox based (such as Camino, Galeon, etc), thus blocking close to 40% of the people online), or there is a bug with RMM/RMP that causes issues with gecko based browsers. Either way, it is something definitely with RMM, and not a browser issue.
What bothers me the most is that there have been reports about this since 2005, yet nothing has been done. Someone comes here seriously asking about it, and they just get shuffled off to a closed thread, where people had only made wild (and inaccurate, uneducated) guesses, with nothing really solving the issue. Then things devolve into a mire of offtopic joking and banter. When will things be looked into or fixed?