Thanks for letting me know that didn't work for you. I'd like to perform some troubleshooting to see if it's a browser-related cause.
Let's begin with opening a Private Window or an Incognito Window in the Web Browser that you're using. Here's how:
Google Chrome: Press Ctrl + Shift + N
Mozilla Firefox: Press Ctrl + Shift + P
Internet Explorer: Press Ctrl + Shift + P
Safari: Press Command + Shift + N
Once you're in the Private Window, log in to your QuickBooks Online account and try printing your Bank Reconciliation Report. If this works, then let's clear your browser's cache. This is to delete temporary internet files and data that are causing unexpected behavior in the product. Here's a link to help you with the process: Clear Web Browser History. Otherwise, you can try using a different browser to refresh your QuickBooks.
You can let me know how this goes for you by leaving me a Reply. I'd be happy to help you further. Have a beautiful day!