Hello,
That’s strange. No, nothing of note happened on that day as far as I know.
1. Perhaps it’s worth reinstalling the coin adapter? From reading the web I see people do reinstall their plugin after getting this error.
2. If the problem persists, it is worth looking at the coin adapter status. Are the adapters still responding?
3. Also look at the output of http://example.com/wallets/api3/get_coins_info/ (replace example.com with your domain). Your coins should be listed there. Are they?
4. If all of the above is OK, it is possible that the plugin was somehow re-installed (don’t know why or how, but it might be worth checking again the user capabilities to make sure they are correct).
5. As always, are there any JavaScript errors in the browser?
These are some things you could check. Please let me know what you find.
with regards