Damn, I was workin on new project. Everything was Ok, I loaded VST effect - xChorus. While saving ( just after this), Renoise froze.
Everything except notation schemes on patterns, got lost. Every sample used and it’s mapping (over 60 MB, incl. vocals and choirs). The only thing that left is 80 kb rns file 
Good for me, I always save work in two files, but I lost about an hour of tracking (damn …) :o
Is it a bug? Maybe a particular problem with THIS VST effect and saving it’s preset settings inside the rns file? I don’t want to check out again this cool feature