fam error "failed to accept new client"

[Joel Baxter <jbaxter@xxxxxxxxxxxxxxxxx>]

I'm trying to get fam working on a RedHat 7.1 box (x86).  In the 
messages log I'm seeing this:
fam[10247]: failed to accept new client: Invalid argument


I've experimented with using the RedHat-target source RPMs for fam 
2.6.4, 2.6.7, and 2.6.8.  There were no problems with the 
configure/compilation/installation as far as I can tell.  I've tried 
running both the fam test app as well as the post-compile tests for 
Courier IMAP (which uses fam, and is the reason I'm trying to get fam 
installed).  In all cases, when I try to run the app, the above error 
message is generated in the log, and the app fails to work as expected.
chkconfig shows the fam service to be "on", and rpcinfo -p gives me:

   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100024    1   udp   1024  status
    100024    1   tcp   1024  status
    391002    2   tcp   1129  sgi_fam

So... on the surface this looks copacetic, but obviously something is 
not working.  Any solution, or just a hint as where to start looking, 
would be appreciated.