numbers and cursor disappear on the calculator

Why does the numbers and cursor disappear after I enter so many numbers and commands, this did not happen with the calculator on any earlier version of Ubuntu ie 9.10, with the calculator on it I could have entered as many numbers and commands as needed and then could have scrolled back through them to checks for errors (if I made any) before I proceeded to calculate, this leaves this calculator useless unless you want to add only a couple of numbers, also I though that this calculator should have improved for the better, if not left alone so at least it did what it used to.