Bug in window resize if view has been rotated
Acrobat reader DC. Windows 7 x64 desktop.
Load a PDF (in my case some A1 building plans) into reader.
Rotate view 90 degrees.
Now re-size the reader application window by grabbing left or right edge.
You will see the bug - can't really miss it. Document suddenly reverts 90 degress and stretches then rotates back when you let go.
Not fatal, just unsightly.