why does manually setting $_COOKIE not work (for using Flash upload utility)

[eluser]Chillahan[/eluser]
The For Each loop builds an array, then $_COOKIE is set to that array.

I am going to try statically building the array with my current values hard-coded in and see if whether that works or not. So far I have noticed there are some extra, odd values in the cookie array (starting with underscores), perhaps set by the Flash uploader - but I don't see how that would block it from working, an array is an array.