Hello kathy-pivotalcre,
Welcome to the Community. QuickBooks is designed to help you bring your finances into perspective using the features in the program. I'll be happy to steer you in the right direction so you can get back to doing the things you enjoy.
I trust that you've checked the Chart of Accounts to see if there's another account in CAD after the USD one in question. Otherwise, in case you may be experiencing browser-related issues, I recommend troubleshooting this by clearing cache and cookies. Clearing cache and cookies is a great way to clean your browser allowing it to work more efficiently. Here's an article that shows you how to do that: How to clear cache and cookies.
Give this a try and let me know how you make out. I'll be here.