Hi all,
Yesterday, I had some problems reading JPG files in my tests. Turns out the problem was that Windows Ruby doesn't set it's Tempfile to work in binary mode. Since I deploy on Linux, that has never been a big problem, but now I'm working on some software that works with binary files exclusively.
Anyway, I am making this fix available as a Rails plugin.
The details can be found here: http://blog.teksol.info/articles/2006/12/08/windows-tempfile-fix-plugin
If you'd prefer patching your Ruby, the fix is in tempfile.rb:55. Or File::BINARY to the other constants in the File#open call.
Enjoy !