ConfBridge 10 error - not picking up bridge configuration

I am installing the latest Asterisk release (Asterisk SVN-trunk-r371052) on a 32-bit Centos 6.3 system. Everything works fine, except for Confbridge, which is crucial to my application. The Dialplan is falling straight through the Confbridge call, and on inspection of the logs I see:

Dialplan

same => n,ConfBridge(21,blammobridge,userinsession,blammomenu)
same => n,Hangup()

Log

– Executing [identify_user@kefalonia:11] GotoIf(“SIP/109.68.162.233-00000000”, “1?start_pin”) in new stack
– Goto (kefalonia,identify_user,14)
– Executing [identify_user@kefalonia:14] NoOp(“SIP/109.68.162.233-00000000”, “”) in new stack
– Executing [identify_user@kefalonia:15] ConfBridge(“SIP/109.68.162.233-00000000”, “21,blammobridge,userinsession,blammomenu”) in new stack
[Aug 16 11:29:58] WARNING[4794][C-00000000]: app_confbridge.c:1429 confbridge_exec: Conference bridge profile blammobridge does not exist
== Spawn extension (kefalonia, identify_user, 15) exited non-zero on ‘SIP/109.68.162.233-00000000’
– Executing [h@kefalonia:1] NoOp(“SIP/109.68.162.233-00000000”, “”) in new stack

I am using a confbridge.conf which I previously used on another Centos (5.2) system, which most definitely does include entries for the bridge, user profile and menu configuration, although any confbridge.conf, including the sample from the website, produces the same error. Any bridge profile in confbridge.conf seems to be ignored - it seems that Confbridge is not reading the conf file at all.