I have the same problem of not being able to match credit notes off bill payments

Thanks for posting in the Community, @accounts278. I'm here to ensure you're able to match your credit notes to your bill payments. 

The Automatically apply credits and Automatically apply bill payments boxes may have been enabled in the settings. That's why you're unable to match the credits to your bill payments. 

To help fix this, let's go to the Automation section to turn off these two features. That way, you can manually apply the credits to your bill payments. I'll guide you how. 

1. Go to the Settings (Gear) icon at the upper right.
2. Select Account and Settings under Your Company. 
3. Go to Advanced from the left menu. 
4. Click Automation.
5. Uncheck the Automatically apply credits and Automatically apply bill payments boxes. 
6. Choose Save. 
7. Select Done. 

The screenshot below shows you the last five steps. 

However, if the issue persists, the browser's stored cache may be full. I'd suggest logging into your QuickBooks Online (QBO) account using a private browser. It doesn't store data in the cache. Thus, it's a great way to isolate browser-related issues. If you're using Mozilla Firefox or Microsoft Edge, press CTRL + Shift + P on your keyboard. For Safari, hit Command + Shift + N. Press CTRL + Shift + N if you're using Google Chrome. 

Once signed in, go back to the Pay Bills screen to match the credits to your bill payments. View the screenshot below for your visual reference. If it works, switch back to your main browser. Then, clear its cache to remove the junk files on the browser. This way, it will function efficiently. Otherwise, please use another supported browser. 

Moreover, I'd suggest running the Bills and Applied Payments report in the program. It lets you review the payments you’ve applied to the bills, such as the supplier credits. Just go to Reports from the left menu. Then, enter the report name in the Search box as seen in the screenshot below. 

I'll be right here to help if you need further assistance. Enjoy the rest of your day, @accounts278.