Hi,
with 2.5.0, when I go from "All Rigs" to "Just Bass", I have my bass rigs (tagged "Bass" by pushing the "Rig" button -> Edit Tag) as expected but when I'm going back to "All Rigs", rigs are all tagged with Bass. It's just a display bug cause when I go again in "Just Bass", I have just my bass rigs and by switching rigs (press buttons in different ways is more exact :P), I finally got my guitar rigs tagged with Guitar.