Some of my personal presets dissapeared when I restarded premiere pro.. But i think i found the solution.. After version update 24.5 this problem seems to appear.. Version 24.5 and before are working fine with holding the presets.
This problem seems to appear by alot of people when I look at the forums.. I use all 3rd party plugins from other creators and i cant update those presets.. So hopefully they come with a solution by future updates from Premiere Pro, so that all the personal presets stay after reopening Premiere Pro.
After update version 24.5 also Bevel Edges, Convolution Kernel, Blurs and Solarizes where removed from the effects panel, maybey there is a relation between that..