Just upgraded (download) to 17 (204) from 11 in Win10. First video, assembled. 55 mins long, 4.5GB, Stereo, One track of Video, several small text overlays, auto fade. 1st attempts (3x) resulted in "Unknown error, render cancelled". Next 2 attempts resulted in locked up render time line at 99%. What settings do I look at to try another route?