I think we've tried everything now to get the consignment store to work with our main family [the others are OK].
There's no interaction with the register, and "Buy" on the Clerk just drops out.
We can't cancel consignments, because the Sim never made any.
We went to "Edit Town", bulldozed the lot, and re-installed a new Store. Same problem.
We bulldozed and built from scratch, ensuring the correct Lot type. Same problem.
Meanwhile, the family that had consignments to cancel has no problems at all.
Come on, EA ... this is a BIG bug fix that's needed.
Please get on with it, or at least admit to the World that you're working on the problem [are you?].