Windows 7 64bits
Nvidia GeForce GTX 750 Ti
When using numerical imput to precisely control the rotation of an object, you can't insert parenthesys unless you've already inserted a multiplication (*). Also '/' behaves diferently inside or outside parenthesys, inside it just works as a division, but outside it divides one to the previous or next number writen and gives unexpected results
To replicate this effects, rotate any object and press /,2. Blender will show Rot: [1/(2|)] = 1641°
Cancel and rotate again, try typing (), if you cant, type *, try again, now you should be able to type parenthesys, now you can check that / behaves normally when inside parenthesys.