Major! Chat is silently dropping specific strings regardless of sender or channel!

[Alhanelem]

This has completely wrecked my ability to play the game as I have no idea if my messages are getting to the other end or not.

I agree this is a problem, but to say it "completely wrecks" the game is a biiit of an exaggeration. 99.9% of all messages work fine. if you don't think someone heard something, just ask them. This really should be fixed (and is very odd) though.

However, I think the odds are high that it could be the RMT filters. some obscure combination of characters in your message could be causing it to be blocked.

They most likely don't produce an error message so that the RMT don't know their shouts aren't working.