I downloaded the latest xlights version onto a new installation of windows 7 machine, and when I try to convert a .vix seq to .xseq , xlights stops. I uninstalled it and reinstalled it and it still shuts down on the conversion process. And I have the files in the correct directory.
I tried a conversion on another .vix file and it did not freeze. So I guess maybe there is something wrong with the other file.