I recall mentioning this a couple of years ago and it was verified by other users back then. The last part of the spin has a pattern overlayed on the image. The old 32 bit version of Satish's 3D LE program worked perfectly, as did older versions of Vegas (7 & 8?). I haven't found an alternate way to do this in Vegas 16 other than the broken spin transition. Pretty much everything else works as expected. I'm on Win 7...bought V18, but haven't gone to Win 10 yet, so it has limited usability with my OS (the issue persists in V18 with a test render).
This happens with all media in SD, HD and UHD.
Any help is much appreciated.