Hi,
There’s a few things to check:
1. Confirm that the version shows ‘pro’ at the end in the MapPress settings screen?
2. Check for a javascript error: try deactivating ALL other plugins and switching to the twenty seventeen theme (for a moment). If you now see the icons, reactivate one by one to find the problem
3. Bring up the javascript console in your browser (F12 in most browsers) and check for any error messages.