A couple of days ago, I started receiving messages from a long-running WP 3.5 site saying, "Unfortunately, an error occurred while creating the minify cache. Please check your settings to ensure your site is working as intended."
I remember updating a couple of plug-ins recently, I think I updated Jetpack and one or two others. That's the only change I can think of. Site content has been static as well.
I also turned on minify settings in W3TC. Messages still arrived complaining about the minify cache.
Thinking that maybe I should move forward, last night I updated the site to WP 3.6; today I received a couple more of these error message.
Naturally, I have emptied all the caches multiple times.
Can anyone recommend where I could look for a log entry of some kind that might give more of a clue of what's wrong -- maybe one that would identify the script or item W3TC is having a problem with?