Has anyone had success using SilkTest with Rational(IBM)'s code coverage tool called PureCoverage?

We are in the process of evaluating code coverage tools to use with SilkTest. Our development team already had Rational's PureCoverage tool so I tried that out. However, when PureCoverage starts our application SilkTest cannot "see" inside any embedded browser windows. Also the Application Under Test became pretty darn unstable. Just our Application Under test and PureCoverage (so running GUI by hand) works pretty well. So I was wondering if anyone had success using SilkTest with PureCoverage (or other Code Coverage Testing tools?)