Pex - In Test Suites when I click on Run Selection option, test case execution showing pending.

Hi,

I am using VS2010 Professional with Pex add-in. I create test suites with 25 test cases and when I select all test cases and select an option Run Selection my test cases are not execution, For many hours status shows as pending. In my code there are different methods like Addion, Sutraction, Factorial, IsSqrt...But if I go to individual method and select Run Pex using Right click, everything works fine. Please help me.

Thanks,

Vaishali