I acknowledge the challenges you're facing with certain functionalities in QuickBooks Online (QBO), louiseb. Let's first determine if the issue is related to the browser and address this to get everything working smoothly for you. I'll provide more insights below.
First, let's ensure that your browser is up to date and clear the cache and cookies, as these can sometimes cause issues with web-based applications like QuickBooks. Trying a different browser or using an incognito mode can also help pinpoint whether the issue is browser-specific.
Here's how:
For Google Chrome.
- Select the menu (three dots) on Google Chrome's toolbar, then select Settings.
- Select the Downloads:
- Select Change if you want to select a default location to save your downloaded files.
- Select Ask where to save each file before downloading if you want to be prompted to choose a specific location for each download.
We can continue troubleshooting the browser by checking the links below:
If these steps don't solve the problem, I recommend reaching out to QuickBooks Online support for a more detailed examination. They can offer specific solutions and check if there's a known issue affecting the preview and export functions. Their team is well-equipped to guide you through technical steps or escalate the issue if needed.
Here's how to contact them:
1. Log into your QuickBooks Online account.
2. Click on the Help button located at the top of the page.
3. Navigate to the Search tab, enter your query, and press enter on your keyboard.
4. Select Contact Us.
5. Under the Callback option, click on the Have us call you button to input your details.
6. Finally, choose Get a Call to receive a callback from support.

For your complete guidance, we can check out this article: Get help with QuickBooks products and services.
For future reference on how to create and customize accounts receivable aging reports in QuickBooks Online, open this article: Run an accounts receivable aging report.
If you require additional assistance about the behavior of your QBO account, please don't hesitate to reach out. We'll offer prompt assistance. Have a nice one.