Strange. I just tried recording with the 30.12.2012 rtmpdump and the version i just downloaded from KSV releases and both worked with no problems? I'm using chrome by the way.
C:\Users\Malky\rtmpdump-2.4>rtmpdump -v -r "rtmp://edge21-b.stream.highwebmedia.com/live-edge" -p "http://chaturbate.com/*******" -C S:malky -C S:******* -C S:2.644 -C S
bkdf2_sha256$12000$Cml4dozmu64A$bC
s47aQOx/Tx7WIZkdyTJMpgkWcfdXX/ZG8oONigPr4= -C S:53ac0c886fe839b4e1ea2b3852fc6796
13d32d97aa1dbd60f228fced06e1cc95 -T "m9z#$dO0qe34Rxe@sMYxx%%" -y "playpath" -o "
*******_1392264929.flv"
RTMPDump v2.4 GIT-2013-12-05 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Starting Live Stream
1357.960 kB / 21.96 sec
Unless the change is slowly being introduced I can't think of any else.