When you take a part and rotate it on the build plate then click on "Arrange" it resets the value you entered for rotation to "0" rather than leaving the value you set in the numerical selector box.
This is very inconvenient if you are testing how many degrees you need to rotate a part.
So, if I rotate a part 40 degrees then hit arrange then go back to rotate more the value in the selector box is now "0" rather than "40".
I have seen others mentioning similar issues with scaling.
I think we really need to leave the values entered alone as they represent the change from the original position or size.