"pdbedit -L -v" on 64-bit hosts shows FF FF FF FF values like this:
Password must change: 9223372036854775807 seconds since the Epoch
while on 32-bit this looks like this:
Password must change: Tue, 19 Jan 2038 04:14:07 CET
tdbdump shows on both hosts this:
key(21) = "maximum password age\00"
data(4) = "\FF\FF\FF\FF"
*** This bug has been marked as a duplicate of bug 1757 ***