Hi user22341,

We can do some browser troubleshooting to isolate any browsing issue. To begin with, let's access your QuickBooks Online account using private browser. A private browser does not store any activities, which is why it's a good idea to use it for any unexpected behavior in the program.

Here are keyboard shortcuts you can use depending on the browser you're using:

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

If you're able to add an inventory item on a private browser, you can login on a default browser to clear your browser's cache. It is a good idea to clear cache, to remove the temporary internet files and to help the application function properly.

Let me know if that works well on your end. Thanks.