File_column, Apache fcgi and error "incomplete headers"

Hello all,

I’m currently deploying an RoR app to a server running Apache/Fcgi. The
app uses file_column, but I can’t upload any files. When I try to, the
process just hangs, until I get the following error in my apache log:

FastCGI: incomplete headers (0 bytes) received from server

I have absolutely no idea what this means or how I can fix it…