Oh heck - I'm cracking up.
It *was* updating - just that the the two namespaces were both used in the identical source files.
Duh

>And I assume you're using VS2010?
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>~~Bonnie
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>>>>If I have the Class View and Solution Explorer open together when I initially select a namespace in the class view all code files in Solution Explorer related to that namespace are highlit.
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>>>>But selecting another namespace in the Class View doesn't update the highlights in Solution Explorer. To get that to work I have first to select an actual object in the Class View then select a namespace.
>>>>Although just a minor annoyance with an otherwise very useful feature - does anyone not see the behaviour or know how to avoid it.
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>>>I do NOT see that behavior. Mine works as expected (click a namespace in Class View, all files in Solution Explorer are highlighted). I haven't done anything or set any properties to make this work like this, because I rarely use the Class View.
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>>Weird. If I expand an Assembly in Class View and click on the first namespace all files using that namespace in the relevant project in the Solution Explorer are highlit. But *definitely* when I click on the next namespace in the Class View the selection in Solution Explorer does not change. I have to click on some object in the Class View and *then* on the next namespace before it works. Don't think I've changed any setting in the environment that might cause this behaviour (even think its unlikely that there would be a setting)
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>>>What do you find so useful about it?
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>>Just handy to see a list of all code where a particular namespace is used. It would be even better if the Class View used namespaces rather than assemblies as the top level and could select all instances of the namespace (in all assemblies) in the Solution Explorer.