Scale tool shift-key constraint
It used to be that holding the shift key while scaling would scale no matter which direction you dragged... now I've got to try to follow a smart guide.
It’s a known bug, and I believe it is fixed in the Beta.
Can you check it and see if it works fine for you?
If not, please provide more details — how do you scale exactly? which snapping options are enabled for you? If possible, please record a video to make sure we talk about the same thing.