# What could prevent the small formula window from working in LibO 3.5? [closed]

I installed LO 3.5 from the LibreOffice PPA. Everything works well up to now except the formula window. I try ADD - OBJECT - FORMULA in LO Writer. The process begins but I can not see the small screen where we write a maths formula. So I try LO Maths but the same thing happened. As a result I can not write Maths formulas. Do I miss something?

OS=Ubuntu 11.10