Render Problems - Glitches on one frame

I had the same problem with Keylight-ed dynamic link. Switching to software-only helped. Also you have to export out from Premiere not from AME. Looks like OpenCL is not at that level yet, that is able to handle keylight effect properly.

I came across this problem today. One item that pops up when you are having problems with After Effects - like this problem - is to clean your cache. Save your project - then close it. Still in After Effects - click Edit - Preferences - Media & Disk Cache. Clear your cache. It has helped almost every time I have an issue. I also defrag my computer after heavy usage and setup to defrag automatically on a weekly basis.

I have just seen this problem in an After Effects CC/Keylight 1.2 + Premiere Pro CC project that uses XDcam footage. So far for us, the quickest way to eliminate it was to turn OFF the option "Lock Biases Together" under Alpha Bias. I don't understand what the logical connection is, but it seems to solve it.

I'm seeing the issue and I'm working with red media. Footage seems to have no bearing.

XDCAM footage also exhibits this in After Effects, it's not just the dynamic link.

The way I found around it is to grab one of the handles on the mask and move it. The glitch disappears straight away. So I wouldn't be surprised to find it's some conflict between Keylight and the mask.

I've been troubleshooting the same issue for a while and have concluded that my problem was caused by Keylight not being able to handle the mark that I added to the layer.  I removed the mask and created a new one, moved it around a bit and noticed that the glitch would disappear and return based on what the mask was at that current time.

Possible solution, ditch your mask and make a new one? 

I have encountered the same problem, shooting on P2, and importing the sequence as a comp from PrP.  Although the click/unclick option does work for me, it only works for each instance of the glitch and on clips with multiple glitches, it toggles them off and on alternatively.  not sure if that made sense...what I mean is one click doesn't fix the entire clip.

the only thing that I have found to fix it, is to directly import the orginal media from the source drive into the project, add it to the timeline and use the corrupted clip in the timeline as a guide to sync it up and trim it appropriately.  then copy/paste whatever masks, effects, and keyframes you applied to the corrupt clip, and then delete the corrupt clip.  (or hide it).

This technique has worked for me on 2 separate projects.  What a huge pain in the arse though.  With more and more of our projects involving greenscreening, we chose to purchase the P2 for it's color space.  Part of the reason we were planning on transitioning to CS6 from FCP7 was the ease of the dynamic link...now this.  Ugh.

FYI - I have encountered this issue again using footage from a Canon 7d.  I was not using Dynamic Link.  Therefore, I believe the issue lies solely with Keylight inside of AE. 

Something that worked for me was changing any of the tick box states within Keylight. It doesn't seem to matter which tick box you change. Battled with this for ages and purging all caches within AE (image, disk, database) didn't work. This did.

Watch this screen capture to see what I mean: https://vimeo.com/52918281

Cheers,

PJ

Try to export to a different drive this should fix it, the drive I'm exporting now is dedicated for AE export only.

I hope this work for you guys.