My Illustrator CS has developed a problem. I can't size objects by using the black arrow in the tool menu. Normally when I size objects up or down I just click on the black arrow and pull at the corners of the object. Now the only way I can size is using the sizing tool or by pulling down on the object menu using the transform menu. The same thing is happening with the text blocks. I've tried re-installing but the problem is still exists.
