Thanks for another confirmation. I did try to read the support forums first, but it's a lot and there always seem to be some reported problems with this plugin of late... After waiting a long time, this latest release seemed more safe to upgrade to from our old 0.9.2.4 than some of the other recent versions.
Our workaround for now was to turn off minify in W3TC and go back to the separate WP-Minify plugin, which is what we used before moving to W3TC two years ago. This is a duplication of functionality behind the scenes but it works and avoids duplicating the CSS/JS code output, and seemed easier and less risky than a W3TC downgrade.
The problem is, W3TC has gotten so complex and there is such a spate of ongoing reported problems that I'm not sure even the developers have a good handle on how to fully stabilize it, much less read or respond to all the support queries here...
My hope would be the developers work on patching existing bugs and providing a minor fix-only release soon than try to add more features. This thing needs to finally get back to "Works!" status for most everyone on the WP plugin page - please!