Image Upload issue - IE9 cannot work

[rosegarden]

I have checked on the following test cases on both my websites and the demo website on flynax

Test sites
- My own website
- Flynax demo site

My website is running on a VPS
The php.ini setting for size upload, time etc. has been maximised so it cannot be my setting on max size upload etc.

Image to upload : 30k

Environment Testing

IE9 in Win7 : failed
IE8 in WinXP: ok
FF 10 - 13 in Win7/XP : ok
Safari 5.0.5 (windows) in WinXP : ok
Chrome in WinXP: ok

I am sure whether I am the only facing, hope others can try as well and reply here if you faced this problem