Okay, have done Giuliomoro, but just hunted down another cable and the GLiss now shows up (using - ioreg -p IOUSB). Thought I post this here, in cas other users had problems.
Here's the output now (looks healthier):
+-o Root <class IORegistryEntry, id 0x100000100, retain 17>
+-o AppleUSBXHCI Root Hub Simulation@14000000 <class AppleUSBRootHubDevice, $
+-o Bluetooth USB Host Controller@14300000 <class AppleUSBDevice, id 0x100$
+-o Gliss-v1.2@14100000 <class AppleUSBDevice, id 0x100000cf9, registered,$
Just went back to the Gliss update, and everything worked fine. I'm not sure what's wrong with the other cable as I use it all the time and never had a problem. However, I guess I need to change cables as maybe it's fine for Teensy, but not for MIDI application(s).
Anyhow, all's well that ends well.