Hi Luigi
Oh dear, you are totally right, there is a bug in this part when Joomla is installed in a subfolder
I will hopefully be able to publish a fixed version soon. If you want to fix this yourself in the mean time, it is easy to find:
Open /components/com_opensim/views/inworld/view.html.php in some editor. On line 89 you find
$assetpath = JURI::root(true)."components/com_opensim/assets/";
correct would be:
$assetpath = JURI::root(true)."/components/com_opensim/assets/";
Greetz
FoTo50