So i got excited when i saw the new update had dropped, and installed it before exporting my user presets…now i have lost about a dozen presets that were meticulously tweaked and calibrated for different brands of materials and different uses. 
I sometimes need to log out and log in again to load the presets.
that did the trick! thank you!
Just an FYI, this has been discussed many times before (including just this a day ago) so you just do a search.
