Hi fairfield-impex,

Appreciate you trying the troubleshooting steps provided. Let's also check your class list making sure they're active on file. Here's how:

1. Click on the Settings icon.
2. Click on All List.
3. Click on Classes.
4. Check if the class you wanted to use is showing on the active list.
5. To view the inactive class, click on the small settings icon above ACTION and tick Include inactive.

Then, try to go back to the Banking page and categorize your transaction. You can also set a bank rule if you want to automatically assign a class on your bank feeds. 

Also, for us to better assist you, I'd recommend contacting our Customer Care Team. That way, one of our support care agents can further check your account.

Post again in the Community if you have more questions.