[thredds] over written file has old global attributes

[Jean.C.Newman at noaa.gov]

I have a set of netcdf files that are being accessed via OpenDAP and are 
regularly overwritten. Most of the files, 29 sets of 31, update correctly 
but in 2 file sets the "Global Attributes" don't update to the new 
information although the "data" does. "ncdump -h" shows the correct 
information, :history = "MOST v2.080 11-05-2007  16:09:22" ;
              :title = "Aleutian-Cascadia: Mwt 8.4, 21.00*b65" ;
  in the headers but when I look at it in a browser, 
http://sift.pmel.noaa.gov/thredds/dodsC/data/crescent_runup_ha.nc.html
I see the old file attributes,
history: "MOST v2.080 11-05-2007  11:49:33"
title: "Aleutian-Cascadia: Mwt 8.5, 29.00*b25".
If I restart tomcat then the correct information shows up.
I'm new at thredds so I may very well be doing something stupid but I 
could find no information. Below is the change I made to 
$tomcat_home/content/thredds/catalog.xml. Any suggestion?
Thank you, Jean
<service name="ncdods" serviceType="OpenDAP" base="/thredds/dodsC/" />
   <datasetScan name="MOST tsunami model data" ID="mostDatasetScan"
        path="sims" location="/home/tg15/data/sims" serviceName="ncdods">
     <metadata inherited="true">
       <serviceName>ncdods</serviceName>
     </metadata>
     <filter>
       <include wildcard="*.nc"/>
     </filter>
     <sort>
       <lexigraphicByName increasing="true" />
     </sort>
   </datasetScan>
  ___________________________________________________________
   Jean Newman                             Tel: 206-526-6531
   NOAA Center for Tsunami Research
   NOAA/PMEL/OERD2 - UW/JISAO              FAX: 206-526-6485
   7600 Sand Point Way NE, Bldg. 3    jean.c.newman at noaa.gov
   Seattle, WA 98115-6349               jcn at u.washington.edu
  _________________________. URL: http://nctr.pmel.noaa.gov/
                          (__________________________________