Windows Server 2008 ifstat and RRD

Hi.  I have started monitoring 4 Windows Server 2008 servers with BBWin
0.11, and I have been seeing a bunch of rrd errors in the rrd log file.  An
example of one is below.

2008-12-12 09:22:53 RRD error
updating /home/hobbit/data/rrd/ifstat.108.0.108.0.rrd: illegal attempt to
update using time 1229095372 when last update time is 1229095372 (minimum
one second step)

Has anyone else seen this?  I believe this is causing the rrd graphs to
stop working about once a week.  These errors only show up for the 4
Win2008 servers and none others.

Thank you.

Regards,

Bryan