Joria, in regards to the consignment store, are you talking about the regular one or the elixir one?
I ran into that issue with the elixir one (and the stuff that had been consigned the day prior suddenly stopped selling for a week). I fixed it by cancelling the consignments and taking it to the regular one, and relisting everything (and made 40k simoleans that same day).
The other option, I believe, was purchasing the venue, and replacing the register.