I'm getting similar errors using 0.9.2.11
If minify is set to auto, I receive a file length message and a recommendation to shorten the length of my file names. If set to manual, files are not found.
The latest message is:
"Recently an error occurred while creating the CSS / JS minify cache: File "path_to_wordpress/wp-content/themes/art/js/weaverjslib.min.js" doesn't exist."
My art theme is a child theme of Weaver II, and and the 'missing' file resides on the parent theme's path
