I don't know about your unit, but when I use my RFID unit I have to unplug the antenna, upload the sketch and then plug the antenna back in to get the sketch to run correctly. Might be worth a try.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16