i want to create gerber files for a pcb. One gerber file per layer more specifically. I have made gerber file on designspark many times before, but now the Positive/Negative option in output manufacturing plots>Settings is grayed out. ( see picture, on the right side, Design 2).
On my 'malfunctioned Design 2', This option only gets activated when i create/Add plots by selecting the 'windows' option, while i need the "gerber/Photo plot option. Any ideas? Thank you.