Is anyone having problems with customers not being able to open your invoices?

Thanks for coming to the Community, @harlingplumbing. 

We received a similar report from QuickBooks Self-Employed (QBSE) subscribers about their customers unable to view/download sent invoices. 

While our engineers are still working to identify and fix the issue, I'd recommend contacting our Customer Support team. Tell them to link your company to INV-46528 so you'll receive updates via email. 

For future reference, check out this article to learn about the newly added features available in QBSE invoicing for both web and mobile versions: What's new with QuickBooks Self-Employed Invoicing?. 

Let me know if you have additional questions. I'll be looking forward to helping you more.