Hello,
The permissions should be as shown at step 23 of this guide: https://www.dashed-slug.net/bitcoin-altcoin-wallets-wordpress-plugin/installation-instructions-web-wallet/
You will also need get_withdrawal_info.
1. As for the issue you are experiencing, have you checked the Troubleshooting section of the manual? (The manual is the PDF in the bundle download of the plugin).
2. It is possible that you may have an error in your JavaScript console. The plugin requires JavaScript to update the views, so please check.
3. Navigate to https://example.com/?__wallets_apiversion=3&__wallets_action=get_coins_info where example.com is your domain name. Do you see your coins listed? If not, it is possible that this JSON API response is erroneously cached on your server, so try refreshing your server cache to check if this is the problem.
Please let me know if the above does not help.
with regards