[vtkusers] false positives?

[Bill Schoolfield]

I built VTK from source on a 64 bit Windows 7 Machine that's using 
Norton Internet Security virus software. During the build Norton reported:

Filename: vtkinteractionimage-6.1.dll
Threat name: Suspicious.Cloud.7.F
Full Path: 
c:\users\bill\documents\vtk-6.1.0.bin\bin\debug\vtkinteractionimage-6.1.dll

It did this for a dozen or so dlls. Each time reporting 
Suspicious.Cloud.7.F as the culprit.

Anybody seen this before? Are the errors legit?