KLN94 "Flagged" When Database Out of Date

My cartridge update for Sept didn't arrive and my database went out of
date - I called Honeywell and they are reshipping, but in the mean
time I've run into a problem. The KLN 94 came up in Nav mode like
normal for the first three days of September, but then on the fourth
day, it came up "flagged" and refused to go into Nav mode. It passed
the internal self check tests although didn't show a radial for the
current position. The KMD880 showed the flight plan but with the
message no external position. Has anyone else had this kind of a
problem when a database went over cycle..... or am I into something
more serious?

AMW