asterisk users - Aug 2004 - 1.0 RC2 - FXS issues - no ring, no MWI

I've had a (small) working asterisk with X100P and 4xFXS TDM card
for a while now.  I've been running the release from (I think)
April 13 - asterisk 0.9.0, zap* 0.9.1.

I tried 1.0 RC2, and my internal FXS line doesn't ring - call
comes in the FXO, gets answered, and rings through to the FXS
extension, but the phone doesn't ring - asterisk shows it ringing
and eventually punts to voicemail.  When I have voicemail, I get
stutter dialtone, but no MWI lamp.

I've looked at the current configuration files, compiler and
startup messages, etc., but I can't see anything obviously
wrong, but still get this behaviour.  I'm running (good old)
RedHat 7.3, with kernel 2.4.20.  If I revert to the April release,
everything's fine.  Yesterday's CVS exhibits the same behaviour.

Has anyone else seen anything weird with FXS ports in recent
releases?

Thanks very much!

John
jsellens@generalconcepts.com