FYI…
Installed VMWare Fusion and Win7 to update Di2 firmware and customize settings.
Went back to Parallels and, voilà, it worked. Device manager showed that the SM-PCE1 got moved to COM4 from COM3. Reminds me of Win95 days. 
FYI…
Installed VMWare Fusion and Win7 to update Di2 firmware and customize settings.
Went back to Parallels and, voilà, it worked. Device manager showed that the SM-PCE1 got moved to COM4 from COM3. Reminds me of Win95 days.