OS X 10.12.6
NVIDIA GeForce GTX 780M 4096 MB
Short description of error
Draging scale widget (small square) in 3D view editor, rotates object
Exact steps for others to reproduce the error
When you are in some axis view (top, left, right, ...) where scale and rotation widgets overlaps, centre of scale an axis widget jumps to rotation mode. Seems like rotation is above scale area. There is just a few pixels aside of centre line that works for scale. Very hard to catch. That never happens with 2.79 transform widget.