It seemed to be a hardware issue - the blue light on the controller was out until I removed and replaced it. It's too much of a coincidence for me though that I just happened to have this hardware issue at the time when the software that uses that hardware was being updated.

I use Vendor/Product ID to access it:

# lsusb
Bus 002 Device 005: ID 10c4:ea60 Silicon Labs CP210x UART Bridge
Bus 002 Device 004: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 002 Device 006: ID 1a86:55d4 QinHeng Electronics 800 Z-Wave Stick
...


<hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x1a86'/>
        <product id='0x55d4'/>
      </source>
      <address type='usb' bus='0' port='1'/>
    </hostdev>