In User Profile Page, the thumbnail points to a bad URL, like that
www.mydomain.comimages/comprofiler/gallery/redflower.gif

Please note that there isn't slash between .com and images directory.

Try yourself:
go to: www.lovedonia.com

Login as: mirtum
Password: a11111

After logged you will see that.

How can I do?
Thank you very much in advance.

Did you get anywhere with this problem? I'm stuck too. My guess is that it has something to do with what the Joomla base thinks is the root URL and not a CB problem but how to fix it...

I unistalled Joomla 1.5 and install version 1.0, now it works fine.
Joomla 1.5 is too young and unstable in Legacy mode.
Besides very few components and modules are written for 1.5, so I decided to use the old version and I'm staying very well.