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Good to see you, @billbeaupre.
The browser's cache may be filled with files and internet data that makes QuickBooks miss the sales tax to click on.
For you to isolate this, you can open QuickBooks on an incognito or private browser. It will help you browse QuickBooks free from unwanted internet files.
Here's how to open it using the supported browsers:
From there, sign in back to QuickBooks and then create or import multiple invoices at once. If that's successful, clear your browser's cache and cookies that are causing this issue.
Alternatively, you can use any of the compatible browsers I've mentioned above to isolate this issue further.
I've added a future reference here where you can find articles about processing customers' payments like record a retainer and handle bank payments: Manage payments.
Tag me on your response below if you have other questions. I'll wait for your reply here. Take care, and have a great Sunday!