I have been having a problem lately with Time FX rendering. When I initially applied the Time FX to a clip (which also has a Color FX on it) it looks fine. But when I render it the video starts "stuttering" and that stuttering remains on the clip after the render. Tried using different codecs but that didn't seem to change anything. Tried losing the Color FX as well. It doesn't happen every time I do this but it does quite often.
Exactly the same is happening with me, also version 13 but even with the time FX on its own. Rendering hardly improves the judder. It has the same look as a field problem but as I know Media 100 is 'top field first' I don't think any settings have been altered. Whilst writing I would mention that since going to version 13 I am having problems with titling in Boris Graffiti. The kerning seems to have gone mad when I type in the box. I am having to set each letter individually with the kerning slider, never had to do that before, anyone else had this problem?