Same place cant to connect to a listed Chatroom with 406 error

I joined a chatroom in conference.jabber.ccc.de but i i reconnect tha chatroom
is listed in gray color and if i try to connect i get an 'Error 406 : Only occupants are allowed to send messages to the conference' .
I'd expect sameplace when i become online again to reconnet to the chatroom also.

System:

 SamePlace: 0.9.4.2009063011
 xmpp4moz: 0.7.2.2009063010
 OS: Linux
 Application: Mozilla Firefox 3.0.17 (2009121601)

Accounts:

 * [username hidden]@jabber.ccc.de
   via jabber.ccc.de:5223/SSL with no proxy
 * [username hidden]@jabber.ccc.de
   via jabber.ccc.de:5223/SSL with no proxy
 * [username hidden]@gmail.com
   via talk.google.com:443/SSL with no proxy

Latest relevant errors from console:

 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_chatstates is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 121}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_http_auth is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 95}]
 [JavaScript Error: "ns_event is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 131}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]
 [JavaScript Error: "ns_muc is not defined" {file: "chrome://sameplace/content/conversations/conversations_impl.js" line: 142}]