I have created a new alias(Ctrl-Shift-Y) for visual studio which executes a specific window (LOB adapter window). The line of code using the alias is the following :

WindowsApplication7Microsof.SolutionExplorerWindow sApp.TypeKeys ("<Ctrl-Shift-Y>")

But since we have created a new test with Silktest old tests are executed inconsistently (using the code above) with Silktest.

It is like Silktest has modified the behavior of the framework when we have created a new test.
Do you know why ?