Same thing here. Been trying since yesterday to buy some things and the game suddenly quits. Coin to spend and unable to do so
It's probably due to the fact that there are too many items in the display list again. Use the filters to cut it down.
And how often/long has that been going on?? If they know that's an issue, and they're TRYING to encourage folks to spend money on the Marketplace (though I have to wonder if they're allergic to making money sometimes...), you'd think that'd be their first priority to fix. :-/ Uwk