Has anyone seen a problem with la.rrd not updating?

["Stewart, Tom L." <Tom.Stewart (at) landsend.com>]

I have over 100 systems that run just fine. But, last Sat night one
system stop updating 3 rrd files. Here is the directory listing.

total 2326
drwxr-xr-x   2 hobbit   hobbit      1024 Sep 25 13:48 .
drwxr-xr-x 163 hobbit   hobbit      4096 Sep 17 16:02 ..
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21 clock.rrd
-rw-r--r--   1 hobbit   hobbit     38556 Sep 25 14:21 disk,root.rrd
-rw-r--r--   1 hobbit   hobbit     38556 Sep 25 14:21 disk,tmp.rrd
-rw-r--r--   1 hobbit   hobbit     38556 Sep 25 14:21 ifstat.eri0.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 21 21:07 la.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21 memory.real.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21 memory.swap.rrd
-rw-r--r--   1 hobbit   hobbit     95508 Sep 25 13:22 mpstat.CPU0.rrd
-rw-r--r--   1 hobbit   hobbit     95508 Sep 25 13:22 mpstat.CPU1.rrd
-rw-r--r--   1 hobbit   hobbit    304332 Sep 25 14:21 netstat.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21 ports.FTP.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21 ports.WAITftp.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21
ports.WAITftpctrl.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21 ports.ftpctrl.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21
processes.defunct.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:21
processes.proftpd.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 21 21:07 procs.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 25 14:22 tcp.conn.rrd
-rw-r--r--   1 hobbit   hobbit     19572 Sep 21 21:07 users.rrd
-rw-r--r--   1 hobbit   hobbit    304332 Sep 25 14:21 vmstat.rrd

When I look at the cpu column, I see normal system info including a
bottom line of loads, but the load graph is blank. I tried moving the
la.rrd file to la.rrd_org but never saw a new one created. The same goes
for procs.rrd and users.rrd.

I looked at the log files on the server and client and do not see
anything.

I also did a rrdtool dump on la.rrd and it showed data up to the last
update and did not give any kind of error.

Does anyone have a clue where I need to look?

Thank you,

Tom