Rotated viewport results in distorted image

Help please - Any viewport rotation other than a multiple of 90 results in distorted image.  On the atttached pdf, the top vp is rotated 90 degrees (image looks the same as it does in model space - good), the bottom is rotated 135 (image is very light, almost a negative in places - bad).

I attached the geotiffs in dwg1 using mapinsert with no adjustment other than some fade, and am referencing dwg1 into dwg2.  Plotting from dwg2.

I initially rotated the all the views with alignspace, when I noticed teh problem.  I've since tried creating a new vp and just rotating/clipping it, same result.  

Any ideas?

Thanks!

MRE

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