I just bought large manual DAV, my second one, and it exhibits the exact same problems as yours. My first DAV was also a arge manual one, and it worked without problems.
Anyway, I just requested an RMA for my second one, but I just wanted to check in here since you also had this problem. Did you end up determining that it was just a faulty product in need of replacement? Or was there some trick you used to get it to work?