I'm COMPLETELY new to 'this stuff' and am having this same problem.
I tried using DVD Decrypter a week ago and was able to write a file to my hard drive and then tried copying the ISO file to a blank dvd-r. It read 100% Buffering and then stops as soon as it reads "Writing Lead In".
So, I thought I would try this week with another program and I picked this ImgBurn. I am having the EXACT same problem. The only difference is this time it picked a MDS file for me automatically when I picked an ISO file to write. Otherwise it's the same problem.
Any ideas?