Big paging problem

Just downloaded and installed the lastest SVN branches of everything due to a Zaptel issue I was having. I’ve got *55 set up as the paging extension, which had worked fine up until this point. Now- it pages alright, followed by quickly crashing Asterisk with the following messages. Any suggestions?

[Feb  8 18:05:34] WARNING[753]: channel.c:1680 ast_hangup: Hard hangup called by thread -1215546448 on SIP/436-097ebe80, while fd is blocked by thread -1216037968 in procedure ast_waitfor_nandfds!  Expect a failure
[Feb  8 18:05:34] WARNING[753]: channel.c:1680 ast_hangup: Hard hangup called by thread -1215546448 on SIP/449-097fd2c0, while fd is blocked by thread -1217643600 in procedure ast_waitfor_nandfds!  Expect a failure
[Feb  8 18:05:34] WARNING[753]: channel.c:1680 ast_hangup: Hard hangup called by thread -1215546448 on SIP/459-09805ce0, while fd is blocked by thread -1217889360 in procedure ast_waitfor_nandfds!  Expect a failure
[Feb  8 18:05:34] WARNING[753]: channel.c:1680 ast_hangup: Hard hangup called by thread -1215546448 on SIP/471-09820420, while fd is blocked by thread -1218626640 in procedure ast_waitfor_nandfds!  Expect a failure
  == Spawn extension (internal, *55, 2) exited non-zero on 'SIP/428-097de100'
asterisk*CLI>
Disconnected from Asterisk server
Executing last minute cleanups