N.B.: these two installs are on WP 2.8.5., not 2.8.4 because pull-down list as of today doesn't include 2.8.5.
Have installed this plugin on two of my sandboxes. In each case, installation goes smoothly - but following the "insert callout" link under "settings" leads to a page which says
"You do not have sufficient permissions to access this page."
In both cases I've logged in with admin rights.
This plugin fills a need - I encourage David Lambert to keep at it - I'm willing to beta-test; and have also tested every pull-quote plugin there is, and done a lot of research on styling and layout of callouts, pull-quotes and sidebars (all related and overlapping), which I'm happy to share.