Hobbit 4.2 - bb2 ack list has strange date

Trying to get a Hobbit 4.2.0+allinone server on CentOS 4.6 x86_64 running.

I am sometimes, when acknowledging an alert getting a very wrong date string showing in the ack log at the bottom of the bb2 page. For instance: Fri May 24 00:07:50 9630 den1log43 disk uiadmin (10.1.10.112) asparks: blown datafile

Where in the world can "year 9630" be coming from?

The acknowledge.log has the following line: 1220503494 525808 60 525808 np_filename_not_used
den1log43.disk yellow asparks: blown datafile, needs rebuild \nAcked by: uiadmin (10.1.10.112)

Is this corrupt data somewhere? I've also tried removing the content of acknowledge.log, but the problem returns as soon as I ack a new alert.

Thanks for any advice. -Alan