The frameserver closes (crashes?) immediately after the first frame is requested. I verified it's still broken on blender-2.64-testbuild1.

To reproduce:
1) open blender and create a meaningless animation
2) Set render output to "Frame Server"
3) Click "Animation" to start the frameserver
4) Open a browser to http://localhost:8080/ (you will see the frame server page)
5) Request the first frame by adding onto the url: http://localhost:8080/images/ppm/1.ppm
6) The frame will download successfully
7) All further requests to localhost:8080 will fail with "connection refused" because the frameserver died and is no longer serving requests on port 8080.

Somebody else noticed the problem and points out where the problem might be:
http://www.blender.org/forum/viewtopic.php?t=24227&sid=f9aac4eaddc8302062332da5c97a9382

OS: Ubuntu 12.04 AMD64
Version: blender-2.64-testbuild1-linux-glibc27-x86_64 (and prior)