effect presets disappear after restart - cc2015

hello from vienna!

i never thought this day would come..
normaly, the internet (and of course this forum) has all the answers & solutions, because every known problem appeared somewhere on earth previously.
until today...

problem: the presets i've imported disappear, when i re-open my project.

i import presets - fine. (right click, import presets, click on it, as usual)
i can use them normaly - great.
i enjoy the workflow in premiere - nice.
i save my project as usual. i start the program the next time and all the imported presets are gone.

i tried to re-import them several times - and everytime they import normal - i can use them - and then, after saving and re-opening the project, they are all gone (and with them, all the progress i made with them)

maybe anybody here, who could help me.. the internet so far couldnt.

best wishes
k

ps: i'm using:
premiere cc 2015.3
windows 8.1
16gb ram
dont know what you probably need to know. just ask. i'm here, hoping for your help. thx.