Let's try some browser troubleshooting steps to fix this, toddnewling.
You can start with using an Incognito window to see if you're able to open the report there. If it works, close it and clear the browser's cache.
I'd also suggest switching to Google Chrome, Internet Explorer, or Mozilla Firefox to generate the Accounts Receivable report.
Keep me posted with the results. I'll be right here if you need anything else.