Thanks for coming back with more details of your concern, @tlheah. 

It seems like you're experiencing a browser-related issue. Please know that QuickBooks Online uses cache to load the page quickly. However, it may cause issues when it gets full. 

To confirm, we can use an incognito or private browser. You can use the following keyboard shortcut keys according to your preferred regular browser:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

Log in to your QuickBooks account, then check if the Show Existing link in your transactions button is there. If that works, follow the steps to clear your main browser's cache. 

Otherwise, try using another supported, up-to-date browser.

Let me know if you have other questions. I'm always around to help.