Hi, Frederick -
After WordPress.org found backdoors in hacker-created versions of three plugins last week, I saw a number of blogs warning users of W3 Total Cache not to update to any version of the plugin released around June 21. I also saw WordPress.org's recommendation after the event that users should update to the versions by that time fixed and released by the author.
I'm assuming the version 9.2.3 showing in the plugin repository is indeed the safe version from you, even though it's dated June 21. Can you confirm this?