Presets refuse to save

Hi all, i got my dig-quad about a month ago and all worked fine, i then updated to the latest version of wled and since then my presets just wont save, I have literally tried everything i can think off including erasing everything on the esp32 with webflasher and reinstalling fresh wled but is still the same. Someone on facebook suggested it was a bug in the v13 and to try the BETA v14 which i have but they still wont save, when i click save preset it just does nothing. If i go onto ipaddress/edit and click the presets json folder, i can see there is 1 preset there which is
{“on”:true,“bri”:127,“transition”:7,“mainseg”:0,“seg”:[{“id”:0,“start”:0,“stop”:547,“grp”:1,“spc”:1,“of”:0,“on”:true,“frz”:false,“bri”:255,“cct”:127,“col”:[[155,153,161],[191,121,0],[0,168,132]],“fx”:0,“sx”:136,“ix”:131,“pal”:4,“sel”:true,“rev”:false,“mi”:false},{“id”:1,“start”:2,“stop”:547,“grp”:3,“spc”:1,“of”:5,“on”:true,“frz”:false,“bri”:29,“cct”:127,“col”:[[155,153,161],[0,0,0],[0,0,0]],“fx”:0,“sx”:128,“ix”:128,“pal”:0,“sel”:true,“rev”:false,“mi”:false},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0},{“stop”:0}]}

Although there is this preset in number 1, it doesnt show any presets on the preset page on WLED itself, its empty and wont let me add any

I have tried deleting this and clicking SAVE but it throws an error 500?

Please can anyone help me, I really need to save some presets to do a little xmas light show and really dont want to have to buy another unit

Thanks in advance for any help