I can open Invoices but Customers and All Sales wont open?

Hi kingwindrefsuppl,

Thank you for reaching out to us.

To isolate the issue, Let us try to do some basic troubleshooting steps. There are times when a browser's cache data becomes full of frequently accessed websites or damaged. This causes unusual behaviors in the QuickBooks system or program. 

I suggest logging into your QuickBooks account through a private browser. This will help us determine if the problem is related to the browser's settings. If it works using the private browser, go back to your main browser and perform a clear cache to remove temporary internet files on your computer.

Use these keyboard shortcuts based on the browser you're using.
·        Google Chrome: Ctrl + Shift + N
·        Safari 11 or newer: ⌘ + Shift + N
·        Mozilla Firefox: Ctrl + Shift + P
·        Microsoft Edge: Ctrl + Shift + P

Please try these steps and let me know how it goes.