Delete it! 
OK. the following without guarantee:
e.g. for surge:
copy your presets to:
/ home / pi / zynthian-my-data / presets / lv2 /
then make a copy of the following file to be on the safe side .
/home/pi/config/jalv/presets_Surge.json
then delete this file, the next time the plugin is initiated, presets_Surge.json will be rewritten.
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You can also click the “Search for Plugins & Presets” button, on the webconf’s LV2 panel 
By doing in such a way, the file is generated, but webconf & UI don’t reload the newly generated file and need to restart. I will fix it ASAP …
Regards,
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Deleting it worked!
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I’m looking forward to your new sounds
Not new sounds, I updated to the new image and was copying across. Here’s a linked upload typical of my average output though. Boot Zynthian from USB SSD
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