My invoices have stopped sending and tab not going green. What can be wrong

I'm here to help share how you're able to send invoices, @AngusSL.

There are times that your browser is full of frequently accessed page resources, thus causing websites, like QuickBooks Online (QBO), to act weirdly. And can be the reason why the sending invoices tab is grayed out.

Saying it is not sending your invoices, have you perhaps received an error message? If not, let's consider logging into your QBO account using a private browser. To use a private or incognito browser, here's how:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P
• Edge: Ctrl + Shift + N

If this works, it means you need to clear your browser's cache so the system can start fresh and you're now able to create and send invoices. But if you get the same result while using a private browser, let's switch to different supported browsers instead.

I'm adding this article that'll guide you in connecting the payment transaction to the original invoice so your accounts stay balanced: Record Invoice Payments in QuickBooks Online.

Let me know in the comments below using the Reply button if you've got questions other than QuickBooks invoicing. I'll be here ready to lend a helping hand. Take care and stay safe!

Hi I have tested a new invoice last night and it all worked.  But still have 7 invoices from last 10 days with grey sent tab. 

Thanks for getting back to us, AngusSL.

Since you're able to send new invoices, I'd suggest deleting and re-creating the transactions from the last 10 days. Here's how:

1. Click + New and then Invoice or Send invoice.
2. From the Customer ▼ dropdown, select a customer. Make sure all of their info is correct, especially their email address.
3. Review the Invoice date. Then from the Terms ▼ dropdown, select the due date.
4. From the Product/Service column, select a product or service. You can also select +Add new to create a new product or service right from the invoice.
5. Enter a quantity, rate and change amount if needed.
6. Select a VAT rate.
   

   Note: If you see the Flat rate, By hour, or By item options, this means you're in Business view. Your experience is slightly different. Select Flat rate or By hour for services or By item for products. Then enter the quantity and amount.

7. When you're ready to send the invoice, select Save and send. Or, if you're using QuickBooks Simple Start, select Send.

In case you need ideas on how to customise and utilise your sale form templates in QuickBooks Online, you can go through this article: Customise invoices, estimates, and sales receipts in QuickBooks Online. This will give you steps on how to add fields as well as change its colour scheme.

If you have any other questions or need further assistance, let me know in the comment below. I'll be more than happy to help you anytime.

Thanks for response. 
on checking with customers today the invoices have all delivered. 
but why does the sent icon remain grey and not green ?

Thanks for getting back to us, @AngusSL.

If you already performed the suggested steps that were shared by my colleagues above, I'd recommend reaching out to our customer support team. This way, they can check your account and diagnose the cause of this issue. 

Here's how to connect with them:

1. Click the Help menu in the upper-right hand corner and click Talk to a human.
2. Type in "Talk to a human", then press Enter.
3. Look for I still need a human and click on it.
4. Select Get help from a human.
5. Choose between Chat with us, Schedule an appointment, or Have us call you.

Please check out our support hours to ensure that we address your concerns on time.

Also, our Help articles might have something that can help you with your other QuickBooks concerns, too. Just make sure that the topic is set as "QuickBooks Online" to browse for related posts.

Don't hesitate to tag my name in the comment section below if you have other concerns or questions. I'm always ready to help.