mangled and/or assumed data in rrds with 4.3.0-0.20080327 snapshot

[Tom Georgoulias <tomg (at) mcclatchyinteractive.com>]

I think I'm seeing some rrd bugs in our Hobbit snapshot, 
v4.3.0-0.20080327, or something in our config is really out of whack.

1.  When a new host is added to bb-hosts, the first data that goes into 
the rrd for the conn test is mangled and wildly inaccurate.  The trend 
charts have an Y axis with a scale like 10 ?, 20 ?, etc., and the rrd 
file is filled to the 576th day with data, most of which looks like this:

<!-- 2007-09-30 20:00:00 EDT / 1191196800 --> <row><v> 8.5485381823e-72 
</v></row>

2.  When a host goes offline and stops reporting, sometimes the rrds 
associated with the disk trend charts simply fill in the missing data 
with 0s instead of NaN.

Any ideas?  I didn't find anything useful in the rrd-status.log.

Thanks,
Tom