416 Requested Range Not Satisfiable
Context: I am using a software package called Social Engine. It is extremely buggy.
Anyway, I asked (paid even) the Social Engine people to do an upgrade and when they finally did so, I logged into the site and noticed that the styles were all missing. I opened a support ticket and all they told me was that it was a 416 error and to contact my ISP.
This error was found by testing the direct link to the CSS files which are located in a writable folder in the software.
I started doing my research only to find it's an extremely rare error and I couldn't see any suggestions for turning range requesting off on my Ubuntu 10.10 Linode server (running latest Apache and PHP5 with APC extension installed). Perhaps it's a software issue? Someway the caching with APC is working? I reset the caching in this software to 60 seconds and made sure it was using APC. Still no dice.
Is it something their software may be doing that I would need to look into patching?