I'm the author of the alive.io plugin http://wordpress.org/extend/plugins/aliveio/
Unfortunately, I've capitalized the S in screenshot-1.png before I checked the file into the wordpress repository (i checked it in as Screenshot-1.png). I have changed the name of the file in my local repository to lowercase screenshot-1.png and checked in but the filename on the wordpress server won't change, so my screenshots aren't showing up =( I've even created a new tag with the lowercase filename, to no avail. In my local repository, file-names are lower case.
Any one have any ideas or suggestions on how to get my screenshots to show up?