It would help to know what error message you are receiving. At what point did things stop working?
I was unable to retrieve you html.pl file as it tells me there is an error .. and can't download the whole file ?? Perhaps it was not uploaded in ASCII mod .. states some binary code errors.
I noticed in your .cfg file you have:
'Inventario Nr.' => [17, 'alpha', 20, 255, 0, '', ''],
'Filename' => [18,'alpha',0,255,1,'','']
'Schedatore' => [19, 'alpha', 20, 255, 0, '', '']
You are missing an ending comma after the Filename field .. it should be:
'Filename' => [18,'alpha',0,255,1,'',''],
It helps to put the line:
$db_debug = 1;
up above the section # File and URL's so that the debugger can catch errors within the .cfg file also :)
Perhaps that missing comma is causing your problems, if not could you be more exact as far as when you started having problems and what exactly is happening.
If all worked fine before adding the upload mod, please be sure that you modified your html.pl file to include the extra fields, and also added the extra field or pipe delimiter to your existing database.
Unoffical DBMan FAQ
http://creativecomputingweb.com/dbman/index.shtml/