Hi there, Rroberts.
You can perform some troubleshooting steps to determine if the issue with sending or creating invoices is related to your browser's cache.
Before that, I would like to ask if you've encountered any error message while performing this. This information will help us provide a more accurate resolution to your situation.
Let's start with clearing your browser's cache. This process will remove any unnecessary and outdated files that slow down your browser. Also, I suggest opening your account using a supported and updated browser to ensure compatibility and optimal performance.
If the issue persists after following the steps, I recommend contacting our live support team. They can take a closer look at your account in a safe environment and identify what's preventing you from creating and sending your invoices within the platform.
You're always welcome to visit this forum if you have other concerns or questions about this.