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Simon,
I don't seem to see the problem you're reporting, but I'm also using our 
latest, greatest, 4.4.2 version.  It's possible that the issue you are seeing 
is a bug that has been fixed, but there is also a good chance that your catalog 
has a problem.  Here is the catalog that I used just now:
<?xml version="1.0" encoding="UTF-8"?>
<catalog name="THREDDS Server Default Catalog : You must change this to fit 
your server!"
         xmlns="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0"
         xmlns:xlink="http://www.w3.org/1999/xlink">
    <service name="all" base="" serviceType="compound">
        <service name="odap" serviceType="OpenDAP" base="/thredds/dodsC/" />
        <service name="http" serviceType="HTTPServer" 
base="/thredds/fileServer/" />
        <service name="ncss" serviceType="NetcdfSubset" base="/thredds/ncss/" />
    </service>
    <datasetScan name="CHESS model precip" ID="ncsstest" path="acuk" 
location="/Z:/testdata/support/WUZ-932114">
        <metadata inherited="true">
            <serviceName>all</serviceName>
            <dataType>Grid</dataType>
        </metadata>
        <filter>
            <include wildcard="*.nc"/>
        </filter>
    </datasetScan>
</catalog>
Perhaps you could try this simple version to see if the error persists.  In the 
meantime, if you send me your catalog, I will take a look at it.
Cheers,
  Lansing
Ticket Details
===================
Ticket ID: WUZ-932114
Department: Support THREDDS
Priority: Low
Status: Open