Very strange - AJAX is flakey when I uploaded my site

The weirdest thing is happening. I have an ajax uploading call, and
after I uploaded it, every part of the controller will work except the
ajax call.

The Ajax call is to a javascript function that is in one of my js file.
Ive confirmed that the controller runs all the way till the render
:update. Then, there I have:

              responds_to_parent do
                    render :update do |page|


This will work sometimes on a first try when I try it through the
website. Any idea why it could be flakey.

I made sure to kill my ghost processes and clear my browser cache.

I did:

killall -9 ruby
killall -9 ruby1.8

Its still giving me problems, what can account for the flakiness?