I used control click on the entire production block, or something, and it ended up printing to chat "can't activate matrix solver" or some similar message, and completely screwed over my production line.

On another note, can you have better documentation for your key combo features? I feel like I don't know what half of them do, exactly.

hello
https://mods.factorio.com/mod/helmod/faq
probably your are set/unset main product or excluded product and switch Product input to filter Ingredient input
there a plus or minus icon on the a product
but that is not use when matrix solver are setted I must fix the bug
try to remove main product or excluded product with Product input/filter Ingredient input switch

edit: hum after try It's not error of matrix solver, the message is wrong

that production line was fucked, I had to rebuild it completely anyway.
Ended using a tech as the top entry, and setting the ingredients to that.

BTW, can you add a token tech that uses all of the science packs? Or change the tech system so that the user chooses which science packs they want to use, and at what ratio.

so I fixed it in v0.11.10
for sience pack you can put science pack alone?