KFW 3.0, XP SP2, VMWare, and Principals with digits

[Matthew J. Smith]

All-
  I have installed KFW 3.0 on XP SP2, running under VMWare for testing.
 I understand that VMWare may be throwing in an unsupported unknown, but
I wanted to throw this out anyway.  We use an MIT KDC 1.4.x, but am
experiencing the same behavior when using my Active Directory.  I have
noticed the following when using the Network Identity Manager:

  I *can* authenticate and receive my TGT successfully when using a
principal composed entirely of alpha characters, such as "matt at UCONN.EDU".

  I *cannot* authenticate when using a principal containing one or more
digits, such as "matt2 at UCONN.EDU".  As a matter of fact, when using such
a principal, all I see in the "Credentials" text area is "(No identities
specified)", and there is no password field.

  The command line "kinit" authenticates successfully in both cases.

  I have previously seen this behavior running XP under QEMU, but I no
longer use that configuration.  I do not run any Windows desktop
natively for comparative testing.

  Any ideas on whether this is a problem because I am running XP
virtualized, or if I have a misconfiguration somewhere?

Thank you all,
-Matt