Checking the model for problems (Model Info > Statistics > Fix Problems)
results in:
Results of Validity Check.
The plane equation for CArcCurve (79346) not valid. - fixed
The plane equation for CArcCurve (375832) not valid. - fixed
Then to get it to work I had to replace Colin’s step 3 with Open New model (discard changes in old model) and then the Paste In Place is done into a new empty model. After this Orbit (and Zoom Extents) begin to work normally.