Confusing Stroke Exposure behavior

[Jkoseattle]

I am trying to use stroke exposure and it's working but I don't understand some behaviors and can't find much documentation. Please see this video to demonstrate:
http://imgur.com/a/yUN1M

I want my stroke to stay invisible until a specific frame. I use the SE tool to hide it at frame 1, then hide it again at the frame where I want to start animating it, we'll say frame 12. This works fine. Then I go to the end frame of the exposure sequence, say frame 24, and use the SE tool to expose it, but one of the keyframes at frame 12 disappears which I don't understand. I then have to return to frame 12 and remake those keyframes. I also don't understand the difference between a Curve Exposure keyframe and a Selected Curve Exposure keyframe. Is there somewhere this tool is better explained?

[funksmaname]

similarly to all other lanes on the time line (like points) you have the black track which shows where ANY point movement is keyed, but the red line only shows where the selected points are keyed.

The stroke exposure keys are the same, the red line only shows keys for the currently selected stroke. The disappearing keys are probably because you are selecting a different stroke that wasn't keyed at frame 12? The 'all' (black) lane will show a key because there is SOME stroke exposure keyed on frame 12, but the red will only show it if you are selecting the stroke that was keyed.

[Jkoseattle]

OK, that explains what the selected (red) channel is about, and I see that now, but it still doesn't explain the behavior in my GIF above. The stroke remains completely selected, but the Selected Curve exposure keyframe disappears, and most importantly, the behavior I've keyed in doesn't work right. I've discovered that if I first create a keyframe with no stroke and THEN re-create that same keyframe with the stroke completed, that the Selected Curve Exposure channel remains intact. This really looks like a bug to me.

[neeters_guy]

I've notice "disappearing keys" too. I've found when you key an unexposed stroke (ie., 0 to 100), it doesn't "stick". That is, there has to be a change in the default values for it to stick. Once you change the values (say, 1 to 99), Moho seems to remember it and stroke exposure works as expected. Also, both start and end percentage appear to be keyframeable so you need to set both otherwise the unkeyed value will float.

This is a small inconvenience, but maybe worth further investigation.