I edited a clip with RotoBrush and after editing 15 seconds of video the tool quit working so I ad to open up a new project and finish the end on another project. Once I was done I exported by going to composition - Render queue. I exported as lossless and tried to play it on my computer when it was done but the clip skips and will not play through. Am I exporting it in the right format? and why did the brush stop working?