regarding error, post http://yourip:yourport/ajquery/?param3=js/state.json here, to pastebin, or anywhere else. it's the only way to find out what's wrong.
from the PC where foobar is installed I get this:
{"playlist": [ {"a":"120 Days","b":"120 Days (CD1)","n":"01","t":"Come Out (Come Down, Fade Out, Be Gone)","l":"8:51","d":"2006"}, {"a":"120 Days","b":"120 Days (CD1)","n":"02","t":"Be
Mine","l":"4:15","d":"2006"}, {"a":"120 Days","b":"120 Days (CD1)","n":"03","t":"C-Musik","l":"7:22","d":"2006"}, {"a":"120 Days","b":"120 Days (CD1)","n":"04","t":"Sleepwalking","l":"3:28","d":"2006"},
{"a":"120 Days","b":"120 Days (CD1)","n":"05","t":"Get Away","l":"4:41","d":"2006"}, {"a":"120 Days","b":"120 Days (CD1)","n":"06","t":"Keep on Smiling","l":"5:30","d":"2006"}, {"a":"120 Days","b":"120
Days (CD1)","n":"07","t":"Lazy Eyes","l":"4:40","d":"2006"}, {"a":"120 Days","b":"120 Days (CD1)","n":"08","t":"Sleepless Nights #3","l":"3:04","d":"2006"}, {"a":"120 Days","b":"120 Days
(CD1)","n":"09","t":"I've Lost My Vision (Kraut nr1)","l":"11:26","d":"2006"}, {"a":"120 days","b":"120 days (CD2)","n":"01","t":"Sleepwalking 120 days Remix","l":"8:00","d":"2006"}, {"a":"120 days","b":"120
days (CD2)","n":"02","t":"Come Out, Come Down, Fade Out, Be Gone (T.A.Kaukolampi remix)","l":"9:33","d":"2006"}, {"a":"120 days","b":"120 days (CD2)","n":"03","t":"Come Out, Come Down, Fade Out, Be
Gone (Reconstructed by Secret Machines)","l":"6:07","d":"2006"}, {"a":"120 days","b":"120 days (CD2)","n":"04","t":"Come Out, Come Down, Fade Out, Be Gone (Mental Overdrive
remix)","l":"9:14","d":"2006"}, {"a":"?","b":"?","n":"?","t":"psychosphere_-_overlight","l":"5:11","d":"2008"}, {"a":"?","b":"?","n":"?","t":"02 Radioactivity","l":"5:21","d":"?"}, {"a":"?","b":"?","n":"?","t":"atma
alpha","l":"7:19","d":"?"}, {"a":"?","b":"?","n":"?","t":"001_Rafael_Peligro-Enchanter","l":"6:54","d":"?"}, {"a":"?","b":"?","n":"?","t":"Mankind","l":"6:46","d":"?"}, {"a":"?","b":"?","n":"?","t":"002_Rafael_Peligro-
Precious_Psychosis","l":"6:48","d":"?"}, {"a":"?","b":"?","n":"?","t":"003_Rafael_Peligro-Cargo","l":"5:09","d":"?"}, {"a":"?","b":"?","n":"?","t":"freedom fighter 128","l":"7:55","d":"?"},
{"a":"?","b":"?","n":"?","t":"frantic MoM","l":"6:51","d":"?"}, {"a":"?","b":"?","n":"?","t":"005_Rafael_Peligro-Lifecoach","l":"7:37","d":"?"}, {"a":"?","b":"?","n":"?","t":"006_Rafael_Peligro-
Fragile_People","l":"7:49","d":"?"}, {"a":"?","b":"?","n":"?","t":"007_Rafael_Peligro-Radiotauglich","l":"6:34","d":"?"}, {"a":"?","b":"?","n":"?","t":"008_Rafael_Peligro-Rollin_high","l":"5:51","d":"?"},
{"a":"?","b":"?","n":"?","t":"009_Rafael_Peligro-Crosshatch","l":"6:17","d":"?"}, {"a":"?","b":"?","n":"?","t":"010_Rafael_Peligro-Storytelling","l":"6:53","d":"?"}, {"a":"?","b":"?","n":"?","t":"011_Rafael_Peligro-
In_a_special_way","l":"6:18","d":"?"}, {"a":"?","b":"?","n":"?","t":"012_Rafael_Peligro-Gorgeous_Life","l":"6:20","d":"?"}, ], "playlists": [ { "name": "Default", "count": "1" }, { "name": "LIBRARY", "count": "6016"
}, { "name": "STATIONS", "count": "18" }, { "name": "FAVS", "count": "309" }, { "name": "Audio CD", "count": "5" }, { "name": "AUDIO BOOKS", "count": "6016" }, { "name": "STREAMRIPS", "count": "32" },
{ "name": "Matt", "count": "583" } ], "playbackOrder" : '4', "volume": "99", "SAC": "", "SAQ": "", "isPlaying": "0", "isPaused": "1", "isEnqueueing": "0", "playingItem": "1381", "focusedItem": "1381",
"prevplayedItem": "4018", "itemPlayingPos": "23", "itemPlayingLen": "259", "playlistPage" : "1", "playlistItemsPerPage": "30", "playlistItemsCount": "6016", "playlistActive" : "1", "playlistPlaying" : "1",
"playlistPlayingItemsCount": "6016", "playlistTotalTime" : "2wk 5d 5:28:40", "queueTotalTime" : "", "helper1": "Little 15 - ", "helper2": "Depeche Mode - Little 15", "helper3": "MP3 | 174kbps | 44100Hz | stereo",
"albumArt": "/albumart_28860.jpg"}
which I think is ok (I got some AJAX errors before making this, but not afterwards).
Nevertheless I still can´t access from any other PC in the network. error (translated) 'firefox can´t get connection to server 127.0.0.1:8888'
edit: added line breaks to the codebox