I haven't been able to get into invoicing whole day, the page kept loading, i tried like many times through out the day. Is there something wrong with Quickbooks server?

Let's try a few basic troubleshooting for this, claudiaslynl.

First, log in to the private browser and let's see if you're able to get into the invoice. Using the private browser doesn't store local files or cache. This way, you will know if it's your regular browser which causes this unexpected behavior.

Follow the private browser's shortcut keys:

• For Chrome, press Ctrl+Shift+N.
• For Internet Explorer Ctrl+Shift+P.
• Firefox press Ctrl+Shift+P.
• For Safari, hold down Command+Shift+N.

If everything works fine in the invoice, you can go back to your original browser and clear the cache. This lets your browser start fresh. Also, you can use a compatible browser with QuickBooks Online.

I've added an article to get more details why QuickBooks Online is slow.

Let me know how the basic troubleshooting steps go.