Objects disappearing in Blender 2.79?? DAG zero... not allowed to happen!

Component:Blender Exporter
Category:bug report
Assigned:David Bluecame
Status:needs review


While doing some tests trying to implement image sequences in yafaray_v3, I had a serious issue in Blender 2.79 / Linux 64bit with yafaray_v3

Sometimes while manually changing from one frame to the next, I got this error message in Blender and all the objects in the scene dissappeared from the scene!!!

"DAG zero... not allowed to happen!"

During that test, I saved the .blend file and when I opened it it was completely empty!   This is a very serious risk and could lead the user to lose all their work in the .blend file.

I don't know if this was related to my tests with image sequences or if this is some kind of weird bug in Blender 2.79. I checked the Core code with some debugging tools and I could not find any reason for this to happen. Therefore it could be a new Blender bug or some weird bug caused by the Python interface between Blender and YafaRay.

This problem is difficult to replicate and will be even more difficult to diagnose/solve :-((  I don't even know if it's a YafaRay bug in the first place, but I could not see it happening with Blender Internal for example.

In any case, please be very careful and before saving your work take a look to see that the objects have not disappeared from the hierarchy. If they have disappeared, don't save the file!!!!



Title:Objects disappearing in Blender 2.79??» Objects disappearing in Blender 2.79?? DAG zero... not allowed to happen!


Ok, so apparently I'm not alone in this bug.

while windows sucks;do rm windows;pacman -S linux;done