What does WebSetBrowser(WebEngine:40 - Browser type setting overwritten by a call to WebSetBrowser()!) mean?
The SilkPerformer Recorder scripts the browser it detects during record in the TINIT transaction.
The default Web Browser specified in the Active Profile for replay is IE 5.5 (in SP5.1.1).
The warning is displayed when the browser scripted in TINIT differs from the Active profile value.
As the scripted functions will take precedence over the Active Profile settings you need to ensure that the scripted functions will not overwrite or interfere with the intended Active Profile settings.