Welcome to the forum Keith B.
I must say the information on Cambridge Audio's webpages seems quite incomplete and somewhat confusing.
The product page of your amp shows no downloads for USB drivers at all.
Then there is a page that lists models that you can download drivers for, but yours isn't on it:
Then on one (easy to find) page they have a download for a version 1.67, but after some searching you will also find a page that has 5.27
- remove all Cambridge Audio drivers from your system. (make sure they are actually deleted, so they won't be reinstalled after a restart)
- if you are using Windows 10, let Windows search and install possible drivers automatically. It should support USB class 2 which is probably all that you need.
- switch usb ports and/or usb cables to see if that improves things. (how long is your cable?)
- don't use a usb hub for your dac.
If that all doesn't help, perhaps post a screenshot of your MusicBee settings: Preferences > Player > Audio player.
The manual of your CXA60 says that it does not support
being used as a DAC over USB.
Only the CXA80 has that.
Did you make a typo on your model?