I seem to have managed to confuse it, by changing my mind - after collecting and then unlocking some evidence, I clicked on it to use it, then wanted to use a normal shape instead - but I can't select one. (doesnt go red when selected), now nothing is actionable apart from the "Roll Two Dice (one unused die)" button, and that doesn't do anything useful.
In fact it errors in code: paint.classList.remove("unconfirmed-shape"); fails because paint is null