uploadify freezing on ie midway through upload

I've been making an uploadify / jCrop library for CI, where users can upload pics, then crop them in a pop up window, 开发者_如何学JAVAnice and easily.

It works lovely, but I've noticed on IE the upload will stop midway through uploading, not at the same place every time, freeze for a while and then I'm hit with an IO error.

It's a pesky problem, and the script works fine in all other browsers I have tested (safari, chrome, ff).

Could you have a look, and let me know if you have any ideas as to what's going on?

http://reallywebdesign.com/uploadify_max

Thanks