There are bugs in the 9,0,48,0 release version of the Adobe Flash Player for Linux (x86) that prevent rsizr from loading images. If you’re a Linux user, please manually upgrade to the latest Flash Player prerelease version (at least 9,0,60) and everything should work properly. Click here to see the Adobe Flash Player 9 Update page. Or, download the latest version directly:
Please let us know if you continue to have trouble using rsizr on Linux.