No, seriously, check your power supply. The prostick plus is a little more power hungry and there have been perhaps half a dozen reports of “bad” prosticks recently that were fixed by replacing the power supply. Failing to talk to the dongle entirely is a symptom of this.
You already restarted the Pi and waited a few minutes, right? The new stick won’t automatically be recognized and start feeding data by just hot plug-replacing it with another unit. A reboot is the best way to restart all the dependent services and get it to use the new hardware.