jaredatch/Custom-Metaboxes-and-Fields-for-WordPress — pull request #339 by davidosomething (2013-08-28 15:31:03+00:00)
Title: Fix assumption that plugins folder is in the wp-content folder

If you have defined WP_PLUGIN_* outside of WP_CONTENT_* the path to the current plugin that is including CMB_META_BOX is incorrect.

Didn't touch windows path, but similar change may be required.