1.75 steam, running on Windows 8.1 x64.
Even when blueprints are hidden, clicking on where a blueprint is brings up the blueprint menu (move, buy, delete) instead of anything else. This means that (for example) if I place a “Fit Engine” over the blueprints for its components (see screenshot), I can never actually click on the Fit Engine block to see (e.g.) the Efficiency.
Likewise, if I layout a conveyor over where blueprints exist, I get the (move, buy, delete) menu and have to escape out of that menu before I can place the next conveyor.
This makes the game unplayable for me.