Yes, finally the problem has been fixed:
Some people (including me) ware having problems that this script created screenshots for all video files in the /files directory, after struggling a while with it I managed to fix the script. I also added some other improvements such as it outputting the images instead of the image URL (which you had to define in the script), and now the additional text can contain spaces.

Code: 
Developed by mRAza
http://www.besthostingforums.com/member.php?u=2934
10/02/2011

CuraHack's Fixes:
> Fixed video selection function
> Added images after screenshot creation; No more text output...
> Added credits below page
> Fixed aditional text: now it can contain spaces :)
> RL logo removed
http://www.besthostingforums.com/member.php?u=12380
May 26 2011
Only the mtn.php was modified, so download/install the other files in mRAza's main post, and overwrite the mtn.php with mine.

You can find the modified mtn.php file here.

It took me a while to do this, so if I helped you out please rep+ me, thank you