I have noticed that in "Internal Preferences" of my SV 13.0 (Build 453, 64 bit) the value of Autocalculate Video Memory (64 bit) is FALSE, although the default value is TRUE. I use the version of 64 bit both in the Vegas and Windows 10. But it is impossible to set this value TRUE, because the SV 13.0 immediately rewrite it. By the way I am very satisfied with SV 13.0. No problem, no crash. Editing, rendering and preview are all OK.