Brian, had a the same problem (as mentioned above) earlier today.
Fortunately, when I looked at the screen, only 4 error windows were opened, 2 error windows from the ‘ftpupd.exe’ program and 2 error windows from the ‘cronairquality2.exe’ program.
To be on the safe side, I closed the 4 windows, exited WD and restarted the computer.