I believe this is probably related to ImageMagick or RMagick. My
captcha works locally, but the image is not generated on heroku. I
don't get an error, just no image.
>From what I've found around the web, people mainly seem to have
RMagick issues with Paperclip, but I've had Paperclip installed and
working on heroku for months now. I didn't even need to include
RMagick in my Gemfile.
Now in my Gemfile, I have
gem 'rmagick', "2.12.0", :require => 'RMagick'
I changed the version due to [this post](http://groups.google.com/
group/heroku/browse_thread/thread/6a617f9549b45e0f/032f5f89aae07c55),
though the newer one installed just fine for me.
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