asterisk users - Oct 2006 - Errors in console in every call made when using 1.4b3

When using Asterisk 1.4b3, everytime I make a call I get continuously 
(around 20 times a second) error messages like the following upon the 
call connecting (or getting to ring):

[Oct 19 17:23:22] WARNING[28682]: channel.c:767 ast_queue_frame: Unable 
to write to alert pipe on IAX2/gradwell-7, frametype/subclass 2/256 
(qlen = 96): Bad file descriptor!
[Oct 19 17:23:29] WARNING[28685]: chan_iax2.c:1834 __attempt_transmit: 
Max retries exceeded to host 84.9.159.76 on IAX2/acron-9 (type = 6, 
subclass = 1, ts=7, seqno=0)
[Oct 19 17:26:14] WARNING[31424]: channel.c:767 ast_queue_frame: Unable 
to write to alert pipe on IAX2/office-1, frametype/subclass 2/256 (qlen 
= 21): Bad file descriptor!

This did not occur with 1.4b2, Is anyone else experiencing this?