Sometimes the test tool interacts with the app in a negative manner. In these cases you need to see if you can find a way around the problem functions. For example, if it always crashes on entering a value into an edit field using the Set function, then see if you can click in the edit field and then send the text to be entered to the window which should enter the value.
I've similar issues in a Java app. For Java there are the internal functions within the object property which solved my problem. I don't know if VB has a similar object, if so, they'll certainly be more elegant the above example.
The application is always crashing for those functions and after that if I tried Application without QTP it again crashed at this step.
After restart the machine the application works fine without QTP.
Please suggest me for that.
Sr Test Engg
IBM India Pvt Ltd