Our users were getting a blank white screen on our homepage yesterday. Inspecting revealed it was just an empty page. All other pages on the site worked fine. I ended up clearing the cache and it resolved the issue.
Any idea why the cache would have been serving an empty page instead of the home page?
Honestly, that's pretty much impossible to say, it could be pretty much anything – though a white screen is often due to PHP errors, in which case you might find a clue in your log files (located at /craft/storage/runtime/logs (search for [error]). Your web server's error logs might hold some clues as well.
