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.
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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.
