Welcome to the Community forum, vst3projects.

There are times that your default browser is filled with data and temporary files from previously visited websites. With this said, when QuickBooks has unexpected behavior, it is recommended to use a private browser. This is to verify if this is caused by the system or your browser. 

To do so, you can use the keyboard shortcuts below:

• Chrome: Ctrl+Shift+N
• Internet Explorer: Ctrl+Shift+P
• Firefox: Ctrl+Shift+
• Safari: Command+Shift+N

Once you've opened a private browser, try to create an estimate/quote again. If it works, to ensure this doesn't happen again, it's a good idea to clear the cache of the browser you're using or trying other supported browsers. 

I'll appreciate if you can get back to me and share how it works. I want to ensure that this gets resolved. Have a great day!