I appreciate you visiting the Community, Maid in Belgium.
To correct this hitch, I'd recommend have your client access his/her email account using a private incognito browser or clear the cache and cookies from the browser before reviewing the invoice. This is to verify if this is caused by the system or their browser.
Here are the keyboard shortcuts that will help you accomplish this in all supported browsers:
Internet Explorer: Ctrl+Shift+P
I'd also suggest, creating a dummy invoice and send it to your own email address to check if it works.
I'd appreciate if you'd able to update me on how it goes, I'm always here to assist.
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