Illustrator (Beta) 28.6 90 (64-bit) rotates artboard or restricts sizing

Since the latest update, I have found several existing documents that are sized to 11" x 8.5" for printing, open and the artboard immediately turns 90 degrees. I can type in the correct parameters for the artboard size (Ctrl-Alt-P) when I go to edit the artboards, but as soon as I hit enter or click off, it rotates back to the incorrect orientation. This has also happened when I create a new document. I haven't noticed it on larger artboards (which doesn't mean it hasn't happened and I didn't realize it), and it doesn't seem to be consistent except for this size. I have never had any issues with these files that I have been using for years until this week after I updated the program. **I just opened my proof template, deleted the content that was on there, and pasted the new content. As soon as I did that, it rotated the artboard 90 degrees. I can copy the template and load it into a new window, and it is fine. ???

Note - 2nd bug - I would have reported this through the "Report a Bug" option in the top right-hand corner of the app, but the link will only open a blank page. I tried three different browsers with the same problem.