Coverage reports differ when using one assembly verses multi

Hi,

Not sure if this is an NCover or NCoverExplorer issue, but we are getting different numbers reported when testing the same assembly on it's own, and when other assemblies are also included in the coverage. The same number of passes/fails from NUnit are being generated, so I'm at a loss to explain why the numbers are lower when we test against multiple assemblies.

This is happening when firing NCoverExplorer from TestDriven.NET in Visual Studio, as well as from the NCoverExplorer summary generated by NAnt from CruiseControl.NET, I guess it's a good thing as at least it's being consistent :)

Am I missing something obvious or is this a known issue?