I am trying to render a project I'm working on using 5 video sources all MP4 files 4 AVC one HEVC. project looks great edited when I play on timeline but when I render one of the files is out of synch by several min. I go back to project play timeline edit and looks perfect. it only does it to one video source. oddly it also does it when i create a multicam track and edit in multicam mode. always same source, I'm on a deadline and need to have a render that matches what I'm seeing on my timeline. is this a known bug of some kind. I've been editing with Vegas since version 2 this is a first for me. any help would be appreciated.