WordPress MU

I'm using 7/06/06 (day month year) and I have a very strange problem.
Under admin dashboard all is ok, images load perfectly and i can see all icons of WYSIWYG toolbar under "write a post".
On the countrary under user's dashboards the images don't load. So I have a situation like this:
Link in the write post / WYSIWYG toolbar works but the icons don't load. So i tried to see if it is an url problem, but no. The images are referred to the correct url. Infact if I copy the images url and try to open it in another browser window all is ok.
I tried with firefox and mozilla same result.
I have to add that I can't load generally all images/icons used inside the dashboard.

Someone can help me? :\

After some testing I see that I can load only this image:
http://virtual.mysite.com/wp-admin/images/wordpress-logo.png
other images from the same directory like this:
http://virtual.mysite.com/wp-admin/images/browse-happy.gif
don't load under user's dashboards

Also as I said before I can't load images like:
http://virtual.mysite.com/wp-includes/js/tinymce/themes/advanced/images/right.gif

Check that you uploaded all the files. Or you can try overwriting the tinymce folder to see if it works.

If the files are all there, check the permissions on them. If that doesn't help, it may have something to do with a dodgy htaccess file - search these forums for itdamagers fix, it may help.