Mac OSX 10.8.2
Intel HD Graphics
Short description of error
Proportional edit mode didn`t work when scaling or rotating.
Exact steps for others to reproduce the error
Create a UV Sphere
Press "tab" to enter in edit mode
Select any vertex point.
Press "O" to enable proportional editing
Press "R" to rotate or "S" to scale.
Move your mouse.
Based on a (as simple as possible) attached .blend file with minimum amount of steps