Logitech USB Speakers not working after upgrade to Yosemite

After upgrading my MacBook Air to Yosemite, my Logitech Z305 USB speaker no longer work.  In fact, it isn't even recognized in the Output list in Sound in the System Preferences.  It worked nearly all the time with Mavericks, with an occasional need for a system reboot if no sound was coming out, but it was always displayed under the Output tab regardless.
I just killed the coreaudiod process in the Activity Monitor, but this didn't do anything of note.
Any ideas of what has to happen for these speakers to work again?
Here are the system specs:
  Host Controller Location: Built-in USB
  Host Controller Driver: AppleUSBEHCI
  PCI Device ID: 0x1c2d
  PCI Revision ID: 0x0005
  PCI Vendor ID: 0x8086
  Bus Number: 0xfa
FaceTime Camera (Built-in):
  Product ID: 0x850a
  Vendor ID: 0x05ac  (Apple Inc.)
  Version: 6.46
  Serial Number: CCGBCM031JDL8LLX
  Speed: Up to 480 Mb/sec
  Manufacturer: Apple Inc.
  Location ID: 0xfa200000 / 3
  Current Available (mA): 500
  Current Required (mA): 500
  Built-In: Yes
Hub:
  Product ID: 0x2513
  Vendor ID: 0x0424  (SMSC)
  Version: b.b3
  Speed: Up to 480 Mb/sec
  Location ID: 0xfa100000 / 2
  Current Available (mA): 500
  Current Required (mA): 2
  Built-In: Yes
BRCM20702 Hub:
  Product ID: 0x4500
  Vendor ID: 0x0a5c  (Broadcom Corp.)
  Version: 1.00
  Speed: Up to 12 Mb/sec
  Manufacturer: Apple Inc.
  Location ID: 0xfa110000 / 5
  Current Available (mA): 500
  Current Required (mA): 94
  Built-In: Yes

I zapped the PRAM and SMC, but that did nothing.  https://discussions.apple.com/docs/DOC-3604
The speakers are still not recognized, nor do they work. 

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