'screen' no longer works in Yosemite - Resource Busy

For many years I have used USB serial devices to connect to external machines, using commands like
$ screen /dev/tty.usbserial-FTFZXCV 115200
Since the upgrade to Yosemite, this no longer works.  The screen commands give an error
'screen cannot open /dev/tty.usbserial-FTFZXCV for R/W - Resource Busy'
There was a similar question from April but that talked about using lost to identify an orphan session. 
$ lsof | grep usbserial   # no output
$ pgrep screen # no output.
The permission seems sensible:
$ ls -l /dev/tty.*
crw-rw-rw-  1 root  wheel   18,   8 21 Nov 19:42 /dev/tty.Bluetooth-Incoming-Port
crw-rw-rw-  1 root  wheel   18,   6 21 Nov 19:42 /dev/tty.Bluetooth-Modem
crw-rw-rw-  1 root  wheel   18,   0 21 Nov 19:42 /dev/tty.usbserial-FTZXCV

From Sony:
In regard to your inquiry, compatible drivers for MAC OS Yosemite will be released by the end of this year.
If needed, please contact me at the phone number below.
Regards,
SONY

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