I created annotive multileader, but later on by unknown reason only two shown on my drawing, others are disppear in both module and paper space, the layer didn't change, the scale didn't change. When I click one and right-click select similar and make copy or move, everything display again, after click anywhere on the screen, nothing was copied and gone again, spent long time to try to figure out but still couldn't find solution, anyone who konws the problem please let me know, thanks very much in advance!
Model, not module, space.
In both 'spaces' toggle the annotative scale through the original and current desired scales, and if needed, go to 1:1 first, to reset them all.
After that, ensure ANNOAUTOSCALE variable is always turned on and it should stop you having to do the above too often.