history corruption?

[Lauren Weinstein]

> This sounds a lot like problems with the index files for the overview
> information.  Do you see any errors from overchan or the like?

Hi.  There never seem to be any logged errors associated with
this condition.

> In search of possible causes, another thing I'd check is if the month time
> period happens to coincide with a rollover of your CNFS buffers.

What's the best way to make this determination, and what would it
indicate?

Thanks.

--Lauren--