http_process_state_prepend - Invalid Action:0x109010

The thing is, all arrows seem to be pointing to the application. This error is generally triggered when the HTTP filter sees something that it doesn't expect, like a Content-Length header that indicates a payload size smaller than the actual payload. Take a look at this SOL for more information on the error:

http://support.f5.com/kb/en-us/solutions/public/5000/900/sol5922.html?sr=36331845

I understand that the conditions of the article probably won't be exactly the same as your environment, but the idea should be the same. For this sort of thing you have at least two options:

1. Fire up WireShark, Fiddler, or HTTPWatch and capture traffic with and without the HTTP profile, then compare the two. Are the content lengths correct in the responses? Are there excessive HTTP 100 responses?

    

2. Open a support case - they'll likely want to see a qkview and similar client side captures.