I have an image sequence layer that I duplicated, Roto Brushed out and used it as an alpha matte to the duplicated layer. I added a Cartoon effect to the duplicated layer, and both layers are precomposed and the composition settings are as follows:
HDV/HDTV 720 29.97
I added this comp to my main comp (has the same comp settings, Duration is different), and allowed time remap to my layer. I moved the end keyframe to slow down my comps speed, and then I added the loopOut "cycle" default expression to the time remap but on the last keyframe of the time remap, right before it should cycle there is a frame of no image, causing it to blink. It only blinks on the first cycle around and not after that. the video is below.