Moi aussi j'ai le même problème, d'un jour a l'autre vlc ne marchait plus sur mon ordi. J'ai essayé sans pare feu, mais ca ne change rien.
Les messages d'erreur de vlc sont les suivants :
access_http error: error: HTTP/1.0 404 File not found
access_http error: error: HTTP/1.0 404 File not found
access_mms error: error: HTTP/1.0 404 File not found
main error: no suitable access module for `http://mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: creating new input thread
main debug: waiting for thread completion
main debug: thread 3796 (input) created at priority 1 (input/input.c:261)
main debug: `http://mafreebox.freebox.fr/freeboxtv/playlist.m3u' gives access `http' demux `' path `mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: creating demux: access='http' demux='' path='mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: looking for access_demux module: 0 candidates
main warning: no access_demux module matched "http"
main debug: creating access 'http' path='mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: looking for access2 module: 7 candidates
access_http debug: http: server='mafreebox.freebox.fr' port=80 file='/freeboxtv/playlist.m3u
main debug: net: connecting to mafreebox.freebox.fr port 80
main debug: connection in progress
access_http debug: protocol 'HTTP' answer code 404
access_http error: error: HTTP/1.0 404 File not found
main debug: net: connecting to mafreebox.freebox.fr port 80
main debug: connection in progress
access_http debug: protocol 'HTTP' answer code 404
access_http error: error: HTTP/1.0 404 File not found
main debug: net: connecting to mafreebox.freebox.fr port 80
main debug: connection in progress
access_mms error: error: HTTP/1.0 404 File not found
vcd debug: trying .cue file: mafreebox.freebox.fr/freeboxtv/playlist.cue
access_file warning: mafreebox.freebox.fr/freeboxtv/playlist.m3u: No such file or directory
cdda debug: trying .cue file: mafreebox.freebox.fr/freeboxtv/playlist.cue
cdda warning: could not open mafreebox.freebox.fr/freeboxtv/playlist.m3u
main warning: no access2 module matching "http" could be loaded
main error: no suitable access module for `http://mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: thread times: real 0m0.250000s, kernel 0m0.015625s, user 0m0.015625s
main debug: thread 3796 joined (input/input.c:399)
main: nothing to play
main debug: creating new input thread
main debug: waiting for thread completion
main debug: `http://mafreebox.freebox.fr/freeboxtv/playlist.m3u' gives access `http' demux `' path `mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: creating demux: access='http' demux='' path='mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: looking for access_demux module: 0 candidates
main warning: no access_demux module matched "http"
main debug: creating access 'http' path='mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: looking for access2 module: 7 candidates
access_http debug: http: server='mafreebox.freebox.fr' port=80 file='/freeboxtv/playlist.m3u
main debug: net: connecting to mafreebox.freebox.fr port 80
main debug: connection in progress
main debug: thread 3796 (input) created at priority 1 (input/input.c:261)
access_http debug: protocol 'HTTP' answer code 404
access_http error: error: HTTP/1.0 404 File not found
main debug: net: connecting to mafreebox.freebox.fr port 80
main debug: connection in progress
access_http debug: protocol 'HTTP' answer code 404
access_http error: error: HTTP/1.0 404 File not found
main debug: net: connecting to mafreebox.freebox.fr port 80
main debug: connection in progress
access_mms error: error: HTTP/1.0 404 File not found
vcd debug: trying .cue file: mafreebox.freebox.fr/freeboxtv/playlist.cue
access_file warning: mafreebox.freebox.fr/freeboxtv/playlist.m3u: No such file or directory
cdda debug: trying .cue file: mafreebox.freebox.fr/freeboxtv/playlist.cue
cdda warning: could not open mafreebox.freebox.fr/freeboxtv/playlist.m3u
main warning: no access2 module matching "http" could be loaded
main error: no suitable access module for `http://mafreebox.freebox.fr/freeboxtv/playlist.m3u'
main debug: thread times: real 0m0.218750s, kernel 0m0.000000s, user 0m0.000000s
main debug: thread 3796 joined (input/input.c:399)
main: nothing to play


Si quelqu'un pouvait m'aider je lui serais tres reconnaissante!!