I am using mm by default in modelling. But in a large assembly a fast and suddenly the assembly started rotating in a very large circle when I was trying to rotate it and the circle is so big in diameter that I could not ablsingle part I made in inch, all other component remains in mm as usual. Now, I was working in very e to visualize it. I observed that some of the components scattered in a very large distance, but when I was trying to move it is not possible, though there was not any mate of these components. Also the colour of the components showing in grey in assembly whereas the actual component colour is different. Please help.