I'd like to share some steps to help you view the mileage and open the invoices, mmoske.
If you access your QuickBooks Self-Employed account using the web browser, we can do some basic troubleshooting steps to fix any browser-related issues.
Let's try opening your account in a private browser to avoid storing any cache files that may be causing this behavior. You can use these keyboard shortcuts:
Google Chrome: Ctrl + Shift + N
Mozilla Firefox: Ctrl + Shift + P
Safari: Command + Option + P
Then, try to view your mileage or open the invoice. If it works, go back to your regular browser and clear its cache. Clearing cache on a daily basis helps refresh the browser's settings. Once done, please make sure to close and re-open your browser.