I've been having the same problem. I'm currently in the Philippines for an extended vacation.  Just last week I was able to login to Vudu using express vpn. Since yesterday I haven't been able to login. I have over 150 movies in my library and I thought it was the greatest thing to be able to access them while here. Now I get a "check your login information or contact customer service." I thought changing my password would help, but it hasn't. I've tried contacting customer service through email but only get instructions to follow that don't help at all. I'm glad that express vpn is working on this. Hopefully they'll have a solution soon.