Hey @Kelly_Chung,
We’re so sorry to hear about the trouble… 
If I understand correctly, are you seeing There was an issue loading your database when starting with a new and fresh database?
If so, if you’d like for us to take a look (it would certainly help us!), could you please:
- restart Roon on your Core
- launch Roon with a new / fresh database
- wait for the error message regarding the database and write down the local date and time
- immediately after, please grab a set of logs
- please, upload them in our drive as a zip file
Please, let us know the timestamp (local date and time) and if the logs have been uploaded (we’re not automatically notified…)
Also, would you be able to share more details about your Core, including the .net firmware version?