It sounds like you're using the QuickBooks Online app for Windows or Mac to access your account. This access point can help keep your work flowing so you don't have to worry about using a browser and with options like being able to use the + sign to open a new tab, it can help you do multiple things at once. In light of all that, I want to make sure that this is working for you as it should.
When it comes to these kinds of errors when using the app for Windows or Mac, there are a few key troubleshooting steps you can take: clear the app cache, make sure the app is on the latest release, and uninstall then reinstall the app. Often, these steps get the app back in working order.
Clearing the cache and checking for updates can be done using the Help menu in the top menu bar of the app. In this case, I recommend the Reset app data and Check for updates options. Don't worry, all the Reset app data option does is scrub the cache and your books will be fine. For uninstalling and reinstalling as well as other important details about the app, check out this article: QuickBooks App for Windows and Mac: General support
Rebooting your system or the Internet connection may also help to resolve these kinds of errors. If you're still running into trouble, reach out to support to connect with one of our agents. Here are the options.
Schedule a Callback or Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat. Support is available from Monday to Friday between 9 a.m. and 8 p.m. ET.