Hi, I just tried to burn a DVD, and as I'm doing that from a network source, I used “dummy write” in case the bandwith wasn't sufficient. Seeing that it was burning at 1x and doing just fine, I canceled the write. It ended, ejected the drive and it was half-burned. So I just lost a dvd, while I only intended to do a test, which defeats a bit the “dummy write” thing :) I'll try to reproduce using an RW disc, if I can find one, but I don't want to lose another one for the moment :)
I just tested this again today and it works fine for me. I also double-checked the code, and I don't think there's any way how this flag could not get set when shown in the gui. So I have to ask you to file a bug with libburn.