No internet connection when running inSSIDer

Hi - just installed inSSIDer…seems to run fine, but when I try to load a webpage, I find my internet connection is gone. After exiting from inSSIDer, everything is fine again. Is this normal?
UPDATE: tried again (third time) and network connection stays up, but very slow. Ran CMD prompt and pinged, one dropped packet but the other 3 went thru. My wifi connection is actually pretty good, so I don’t think it iis that.