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Hi Dan:
I can no longer view your NcML, but the problem is probably in the declaration 
of the coordinate variable. The old example had:
  <dimension name="time" length="0"/>
  <variable name="time" type="int" shape="time">
    <attribute name="units" value="months since 2000-6-16 6:00"/>
  </variable>
  <aggregation  dimName="time" type="joinNew">
  ...
now it should be:
  <variable name="time" type="int">
    <attribute name="units" value="months since 2000-6-16 6:00"/>
  </variable>
  <aggregation  dimName="time" type="joinNew">
  ...
It is kind of a bug, but since there's a workaround i may not fix it just yet.
lemme know if that ixes it
Ticket Details
===================
Ticket ID: NCD-931813
Department: Support THREDDS
Priority: Normal
Status: Open