Hi Kelly,
Thanks for reaching out! The bug introduced by WordPress 4.8.2 only affects the core version of The Events Calendar–as Events Calendar PRO simply extends the core functionality provided by this plugin, it does not need to upgraded separately. (You also won’t need to pay extra to receive updates such as these for Events Calendar PRO; these are included with your active licensing!) Once your install of The Events Calendar has been updated, your events in Month View should be fully restored. Let me know if you should have any questions about how to perform this update! 🙂
I hope that helps! Thanks again, and please don’t hesitate to follow up if you should have any other questions or concerns!