error : This is not a valid image file

[xlprox]

After upgrading to vb 3.8.1, I got report from members :
If upload image (gif, jpg) appear error : This is not a valid image file
(upload other extension except image , working fine)

I try upgrade php to newest version : php 5.2.8 but still can not
Permission and image size = fine.

Please try visit w**.kotasatelit.***
Please register and try to upload a small image : jpg, gif
...for testing upload, please do at topic : "Tips dan belajar posting" (lowest page)

:: I already contact ur support but he told me put this case on forum.

Waiting any comments whom can solve this case

Thanks.