[Mihai]

I thought you ment some serious bugs in the render itself...

see that all is loaded and voxelization started, and go home. and than find in the morning, that the render finished successfully because it stayed at the same SL...

But when you load an MXS or MXI, it warns you that the SL is already reached - before any voxelisation happens....?

[chedda]

I can confirm this also happens to me. It's a real pain in the ass. I just lost 60 hours on a render, because i stopped it. I tried all the methods you suggested. Still some instances are transparent. I am using the sketch up plugin 2013, and osx mavericks 10.9. But i have always had this problem it comes and goes.I cannot understand what causes it.