Hi everyone,
I'm pleased to announce that this problem is now solved.
Helpdesk suggested that I use the latest driver (10.11), the latest Service Tool (7.1.12) and the latest WS403 firmware (11.00j).
It's now working as it should. I'm able to connect with the WS403, download programs remotely to Danfoss controllers, log some checkpoints, change parameters, etc.
Really nice product. It will be nice for remote troubleshooting/tuning.
Thanks again PLUS1 Support!
Sam