Allow me to share a few details of this experience with your standard users, @howardjennings.

I'll make sure that your standard users can view the custom invoice templates again in no time. So, they can get back where they left off. 

By September, QuickBooks Online customers will be moving from the old/classic invoice/estimate experiences to the new experiences. There's a possibility that your account is included in the update. That's why your standard users are unable to see the custom invoice templates.

With this, I'd recommend sending reviews to our product engineers. Thus, our team will know what your old users encountered about the update. 

Here's how: 

1. Go to the Gear icon and choose Feedback. 
2. Type your concern or suggestion in the box. 
3. Click Next. 

To know more about the new invoice experience, check out these articles below: 

• See what’s new with estimates and invoices in QuickBooks Online
• QuickBooks Invoices and Estimates FAQs

Remember that you can always ask me about any topics or other processes within QuickBooks. I'm always ready to work with you again. Stay healthy and safe, @howardjennings.