I downloaded 2017.17 (64 bit) tonight and when I opened up xlights I got a very long error message popup showing that all of my models were overlapping each other. I went ahead and opened up a sequence I am working on and used the "check sequence" utility to see if the overlaps were still noted before and after rendering; they were overlapping in both cases. So I rolled back to 2017.16, re-rendered; no similar problems noted. I can reset 2017.17 as my working executable again and post the xml files if needed. I figured I should stay with 2017.16 for now so I don't corrupt the file I am working on...