So, it appears there's probably a bug in the on-the-fly process in K3b 
3.5.13.2 aka 1.0.5-1.oss131.opt.x86_64 in openSUSE 13.1 that's a bit 
worse than a similar one in 12.3's

It has nothing to with opensuse or any other distro
It has everything to with K3b....for the last 4 years already.
Do a search with google.
Do a search on various Forums

I use (used ) K3b for everything...""except burning isos, ""
Acetoneiso still has to give me my first toasted-DVD after using it for 
4/5 years.
K3b does that exceptional well after first try

Just my experience and my opinion.
Hope other people were more lucky