I just had this happen as well, but I think it was the way that the original file was named. I was provided a QT that I scene cut, when I went to render I think it kept getting hung up on the fact that the file name had a ” / ” in the title. I was rendering with “use prefix, suffix, no. of digits from source” selected. When I un-ticked that, it rendered fine.
Robert Due
Editor / Colorist
INDEPENDENT EDIT