thumbnails and resized pictures not showing

[topcat]

http://www.wushu.org.ua/photo/index.php?lang=english

Some days ago thumbnails and resized pictures disappeared. I don't know how it happen.

But.
If you look the source of page, you can see something like this:
<img src="" class="image" width="0" height="0" border="0" alt="image001~4.jpg" />
Where is src?

"Database upgrade" in Admin tools didn't help.

Thumbnails and resized pictures are still present in FTP directory. The SQL database also looks untouched (but i'm not sure).

What could it be? What I have to do?
Thanks.

[topcat]

oh, i forgot
maybe it's because my hosting provider updated his operating system to FreeBSD 6.2 STABLE from RC1?