Was failing to load local files or remote {mp3} {wmv} ... no video or audio. I saw that had a javascript error. The code was missing some quotes (') which comes at the beginning of some lines.

correct:
    var cfg = {
          'file': 'images / videos / video.wmv'

error:
    var cfg = {
          file ',' images / videos / video.wmv '

Note that there is a quote before file. I saw the file "jw_allvideos / includes / sources.php" is correct. But for some reason the loading removes the quotes. I tried changing the single quotes with double quotes, ie, where it has (') I switched to (\") and it worked.
Files were loaded normally. I do not know if it is some configuration problem on my installation of Joomla, but now everything is working. If anyone has the same problem can check that should be fine.
I wonder if the developers they've seen this problem.

Att