I have a problem that's kind of weird. The numpad operation keys (+, -, *, /) dont work as expected. I cant do the math when transforming objects.

For example hitting G while object is selected, then X then 2 + 2 doesn't move the object 4 units on the X axis, instead - it moves it 22 units, like if that + hit was ignored.

I've noticed it when moving from Blender 2.68 to later versions. (actually after installing 2.68 after the installation of 2.75, the 2.68 also works that way)

Is there anyway to get back the old functionality?