Hi .My invoices I've sent have been viewed. But the last 2 days are now saying they haven't been viewed and I cannot mark as paid.

Let’s perform some troubleshooting steps to  ensure the invoice reflects the correct status and allows you to mark it as paid, rigby.
 

Let's begin by clearing your browser's cache, to refresh the setup and eliminate any corrupted files that may be causing the issue. 

Alternatively, you can use a different supported browser to verify if the invoice status updates correctly and mark it as paid. 
 

If the issue persists, I recommend reaching out to our Live Support team. They have the tools to check your account and assist you. Here's how to contact them:
 

1. In the upper right corner, click the Help icon.
2. Go to the Search tab and enter your concerns.
3. Select Contact Us.
4. Choose a way to connect with us: Have a Callback or Chat with us.
    

Let us know in the comment section below if you have additional questions or concerns.