Thank you for your suggestions. You were right, changing the slasharguments worked.
But, in the first installation in http://www.iberenglish.com/elearning where the version 1.5 is installed, the parameter for slashargument is configured as file.php/pic.jpg.
The file .htaccess does not exist in either of the directories because the hosting has it disabled.
What I don't understand is why the two installations work in different ways when "AcceptPathInfo" is "on" in the Apache configuration (according to my hosting provider)
Anyway, what I would like to know is this bit of information. Why one installation works but the other doesn't.
Thanks in advance for any information you can share.
Have a good day!
Angel