cannot see the attachment

[3iHung]

When open any attached file, it shows a small image (clear.gif 1x1 pixel). Something likes this http://www.vbulletin.com/forum/showthread.php?t=84027 However, the customer is using vBulletin 3.5

is there any way to check what the reason is?

thanks

[SoftWareRevue]

...
is there any way to check what the reason is?

thanksWell, troubleshooting is a process. Like the link you supplied.

Is this a new install?