wbinfo -i stops returning full name

[Brian C. Huffman]

All,

I'm experiencing a problem where wbinfo -i <user> isn't returning the 
full name.  I'm using winbind 3.5.6 on both Fedora 13 and RedHat 4.7 (it 
happens on both).

I'm using a Samba4_a13 server.  It appears to work correctly on the server:

Server:
[root at eti-sam4 var]# wbinfo -i testuser
testuser:*:3000010:100:Testuser Lastname:/home/ETI/testuser:/bin/false

Client:
[root at polaris ~]# wbinfo -i testuser
testuser:*:16777216:16777216::/home/ETI/testuser:/bin/bash

I found a RedHat Bug report that seems to indicate that a workaround is 
to stop winbindd, remove all the *.tdb files from
/var/lib/samba/* and rejoin the domain and then restart winbindd:

https://bugzilla.redhat.com/show_bug.cgi?id=631617

Does anyone have any idea why this might be happening?  Should I open a 
bug or is it perhaps a configuration issue?

Thanks,
Brian