I think that its like whatMirek said the graphics card, what have you got as Maya can be a bit pickey when it comes to graphics cards, I woild try to download the latest drivers for it and give that a go.
I'd be surprised if its a bug with 8.5, as this would have come up a lot in othe forums, ive got to ask what were the bugs in 8.5? I've never had a problem with it! Must be me and the lack of tools that I use!
Can you scale in the persp view but not some of the orthographic ones? If thats the case then I woukld go with the graphics card
"No pressure, no diamonds" Thomas Carlyle