I just went to write an invoice and all my contacts, history and information is gone???

Hi there, 

Thanks for reaching out to us in the Community. It's important you're able to access and use your account to create invoices with ease. Rest assured, I'll be happy to steer you in the right direction. 

I'd like to start off by troubleshooting this issue to determine if it's a browser display issue. Clearing cache and cookies is a great way to clean your browser allowing it to work more efficiently. Here's an article that shows you how to do that: How to clear cache and cookies. If this doesn't work, I suggest using a private/incognito window to see if that works instead. I also recommend making sure you're logged into the correct account as that can be a cause to the issue you're experiencing. In case this issue persists, I encourage you to contact our support team so they can assist you further with this. Here are our contact details: 

• Schedule a Callback or start a Chat: click (?) in the upper right in QuickBooks Online > enter "Contact support" > choose Contact Us > provide a brief summary > select Let's Talk > choose Get a callback or Start a Chat.
• Social Media: Facebook, Twitter, and Instagram.
• Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.

I'll be one message away in case you need further assistance.