I had the error mentioned by others in the forum, went to mod updates in game, halfway done the game and steam crashed completely, then i tried redownloading a fresh copy, and still nothing works. I can't seem to flip my prints.

I think it was just me. The functions worked before the latest update to the mod. Had to do with something in my mod list, because that got replaced to play older factorio, and when I put everything back, that file essentially got nuked. Now... everything is fine. Thanks anyway.

For me, flipping works fine when using separate blueprints. But when I use them as part of a blueprint book, flipping blueprints no longer work.