Strange Dimension Corruption in SW 2007 sp5

I am experiencing a strange corruption of dimensions in SW2007 sp5 since I installed SW2008 sp3.
I have experienced 3 cases were baseline dimensions referenced to atangent edge have become incorrect after saving the drawing.
In one case dimensions referenced to an inside tangent edge of atube showed the dimension figure to the outside of the tube.
In another a baseline dimension to two points from a tangent edgeflipped the 2 dimension values corrupting both dimension values(see JPEG)
Graphics card is a Quadro FX 1400 Driver is approved 6.14.10.9136

Tech support are asking me dumb questions
Has anyone else seen anything like this?SolidworksDrawings And Detailing