Pixel Motion Blur bug?

I've applied time remapping to a layer in a comp along with Pixel Motion Blur. I'm running into a peculiar issue where the monitor frame will stay completely frozen, even though it's green bar-ed. The audio will play fine but the monitor stays stuck. I added effect opacity keyframes on the PMB at the same timecodes as my time remapping, plus two additional keyframes on either side of those, one frame behind/in front. So basically my comp is set up to have 0% opacity on the pixel blur until the keyframe before the time remap starts, then on the very next frame it's at 100%, stays at 100% until the last keyframe in the time remap, and then back to 0% the frame after. What's weird is that if I change the order of the keyframes, ie 100%-0% instead of 0%-100%, it works fine. Furthermore, if I keep the keyframes in the same order but change the 0% keyframe to 1%, it works. Am I missing something really basic here? Or is this just a bug? Is there a more efficient way to achieve what I'm going for all together? I appreciate any help.