Replay Export issue

For some odd reason, I had no issue exporting replays all of season 1 in MP.4 and Webm (webm was terrible quality comparatively, still is). But now I cannot export MP.4 at all. I can only export Webm and it's incredibly choppy and when converted to MP.4 for editing it looks even worse. I tried dumbing down the graphics, playing with all the replay settings, speed, quality, frames etc. No matter what I've tried MP.4 exports seem to have broken for me. I've completely erased everything from my PC Skate. wise and reinstalled cleanly (yes I have plenty of room storage wise for videos to export). I'm not sure if anyone has found solution, but if you have any work around or found a way to fix the export issue please chime in, as I'm sure others are having the same issues with the replay editor since the addition of keyframes and a more advanced replay system.