I updated this morning and using Economics, it says the player has 0 coins to use even though they have coins. The attached screenshot shows a player with over 10,000 coins. Displays 0. He was still able to spend his coins:
From my config:
"Switches to Economics as default curency": true,
"Switches to ServerRewards as default curency": false,
"Switches to Custom as default curency": false,
"Allow Custom Currency Sell Of Used Items": false,
"Custom Currency Item ID": -932201673,
"Custom Currency Skin ID": 0,
"Custom Currency Name": "",