When I looked into that one, I checked the error.log, noticed it was trying to load the file "sets/.php", and then went back and noticed that the Set field in the form was not set. I set it to Alfaerie: Many, but when I changed the group to Unique, the set switched to Alfaerie: All SVG. In sets.php, I noticed that Alfaerie: All SVG was not assigned a group. So, I assigned it to Unique and reloaded the page. But when I selected Alfaerie: Many and changed the group to Unique, it still changed it to Alfaerie: ALL SVG. I couldn't figure out why that is happening, but when I saved a test version of your preset with the set set to Alfaerie: ALL SVG, it at least displayed the board instead of giving me a blank screen, but it did not display anything further. When I added "&submit=Edit" to the query string, I saw that the change I made had been saved. For one further test, I deleted the Pre-Game code and saved it again. This time, it did not give me any problem. So, there may be something in your code that is not parsing properly or something.
This is what I cut into the clipboard:
alias E A e a W D w d H .WA h .wa G .H3 g .h3 C+ CW N+ NW c+ cw n+ nw E+ BD e+ bd W+ RW w+ rw;
empty c5 c6 d5 d6 e5 e6 f5 f6 g5 g6 h5 h6;
dump;
When I looked into that one, I checked the error.log, noticed it was trying to load the file "sets/.php", and then went back and noticed that the Set field in the form was not set. I set it to Alfaerie: Many, but when I changed the group to Unique, the set switched to Alfaerie: All SVG. In sets.php, I noticed that Alfaerie: All SVG was not assigned a group. So, I assigned it to Unique and reloaded the page. But when I selected Alfaerie: Many and changed the group to Unique, it still changed it to Alfaerie: ALL SVG. I couldn't figure out why that is happening, but when I saved a test version of your preset with the set set to Alfaerie: ALL SVG, it at least displayed the board instead of giving me a blank screen, but it did not display anything further. When I added "&submit=Edit" to the query string, I saw that the change I made had been saved. For one further test, I deleted the Pre-Game code and saved it again. This time, it did not give me any problem. So, there may be something in your code that is not parsing properly or something.
This is what I cut into the clipboard: