This took me a while to figure out, so I’ll post it here in case someone else ever gets into this problem. Â After enabling WP Super Cache for a project at work, we’ve started seeing really weird and really random white page issues. Â WordPress would show a blank page and then a few minutes later it would start working again. Â But then it would disappear and so on and so forth.
Tracking the issue down, I’ve tweaked the WP Super Cache configuration quite a bit, but that didn’t help. Â And I was sure that it was related to WP Super Cache, since periods of appearing and disappearing were consistent with cache timeout settings. Â Browsing through WordPress support forums (threads one, two, and three) game an idea that it wasn’t just WP Super Cache on its own, but a combination of WP Super Cache plugin with something else on the system.
After a lengthy troubleshooting process, I think I nailed it. Â APC – an alternative PHP cache module – wasn’t friendly with WP Super Cache. Â So, as a short-term solution to the problem, I’ve disabled the APC and now everything seems to work well. Â I’m a bit busy now to troubleshoot the problem further, but if you have any idea of why that could be happening, please share.