I appreciate you chiming in on the thread, @Rovira. I'm here to help you so that we can be able to fix this issue.

As I've replicated here on my end, I can pull up reports in QuickBooks Online. In your case, it may be a browser-related issue, which is a possible reason I'm seeing as to why you're getting a blank white screen on your end.

We can perform troubleshooting steps to isolate your browser and make it work better and faster. Also, this is likely a cache-related issue, and you can rule this out by using a private or incognito window. Use these shortcut keys to open an incognito window:

• Google Chrome: Press CTRL + Shift + N.
• Safari: Press Command + Shift + N.
• Mozilla Firefox: Press CTRL + Shift + P.

Log in to QuickBooks and pull up some reports again. When you're able to do so, go back to the regular browser and clear the cache. 

This will remove the webpage data that's causing the issue. Close out any browser instances to complete the process. You can, however, use another supported browser.

You can refer to this article for more details: Troubleshooting browser problems. The guide is from another region, but it also applies to your version.

For future reference, read through this article and learn about customizing your report to view the specific data you want to appear: Customise reports in QuickBooks Online.

Let me know if you need further assistance about managing reports or any other related QuickBooks concern. I'm here to help you. Have a great day ahead!