The council changed the paper used after complaints in 2009, when hundreds of plastic-coated parking receipts were picked up from the Otago Harbour, some almost a decade old.
The new rolls have suffered from the damp in the past, causing about 120 machines to fail in extended drizzly weather in February last year.
Mr Smith said technicians had been "working furiously to get the numbers down'' of broken machines yesterday, removing their wet rolls.
The machines flashed up a message saying no payment was required, and motorists were allowed to stay for the maximum period for the park.
There are about 350 pay and display machines in Dunedin.