Quote - Workaround as per the ds forum

 

LuxRender 1.1 has a bug that prevents it from writing film files.  Even when File->Save & Exit is used, it only writes the tonemapped image, not the film file.  (File->Save FLM does work, however.)  This means you cannot restart a render, or recover in the case that Lux/your computer/etc crashes.

The workaround for this is to switch to the Queue tab in LuxRender and enable the ‘write FLM’ override checkbox.

 

Still please let us know as soon as a more stable version is out I love the new speed!

I wish had seen this a few days ago.  I have a render that I've been running overnight, shutting down when I go to work, then starting back up, and I couldn't figure out why it never seemed to be clearing up.  Maybe that's because it was stuck at the first 90 S/p that I ran it to before I updated Lux and not saving.