Can someone explain to me what the I/O error is about?
This is what I would like to happen. I'd like Uploadify to make a form post to the URL I supply. That's it. As long as the URL post was made I don't need it to check if the file was uploaded successfully or not.
The IO Error #2038 is a generic error outputted by Flash when it can not complete it's task correctly. It is vague and not helpful in the slighest, but as it is that last error outputted, it is the one that gets displayed. To find out what errors are happening before the IO Error you need to add some error handling routines. You can find a sample in the Showcase thread