Well, I am, but I usually compile with Ant and launch the player from the build script. So, I really didn't remember which are the default settings. Well, that's not really related. In your case you'd need to configure the builder to launch whatever it compiles in the run configuration follow these steps: http://livedocs.adobe.com/flex/3/html/help.html?content=compile_debug_4.html#149153 they shouldn't be very different if you have FB4.
Best. Oleg
