Hi there, GBE.

I know the importance of having the third application working. I can guide you to fix this.

Unusual behavior like this is sometimes caused by accumulated internet files stored on your browser. Let's perform troubleshooting steps to fix this.

Let's start by accessing your account using an incognito browser. Use the shortcut keys below:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P 
• Safari 11 or newer: ⌘ + Shift + N

Also, you can use other supported and up-to-date browsers. If this works go back to your regular browser and clear the cache to remove stored internet files and improve the system performance.

In addition, you can also subscribe to QuickBooks payment or consider opening a Melio account as what @Fiat Lux - ASIA suggested to further isolate this issue.

For your reference, here's a handy material that contains a link to help resolve Bill Pay issues and answers to frequently asked questions: What is Online Bill Pay?

Let us know if you have further questions or concerns about Bill Pay. I'll be right here to answer them for you. Have a good day!