Rhino 6, Selection issues. Does not select all objects unless is perspective view port

I have recently upgraded to Rhino 6, and continue to have issues.

There seems to be a bug with Rhino 6, whereby in the ortho viewports [top, front, right], it is not possible select all objects, in particular dimensions.

what I am finding is that if I have a model, and I make dimensions on the part in the front view, and then when I got to select all the objects in the top view [by left click and drag over all the parts], it does not pick up the dimensions that where made in the front view. I am able to resolve this by selecting all the parts in a perspective view, however this seems like a bit of a strange work around to have to do…

I have not had this issue in the Rhino for, and hoping this is just a preset?