Thread:Extension talk:Collection/File not Found Downloading PDF

I upgraded mw from 1.17 to 1.19 and Collection Extension from svn repository from release 85082 to the latest one 115663. Before the upgrade all eas ok, but now it stop working. The system renders correctly the document, but when I try to download I got the File Not Found message and in the mwlibcahce dir I can found the file output.rl that if renamed in .pdf is exactly the pdf version of my document. Any Idea ?

Thanks in advance.