A couple of times today, Spark has caused this Exception in Openfire
2011.07.01 15:08:46 Rejecting packet. JID malformed
java.lang.IllegalArgumentException: Existing at-character at the first character of the string indicates that an empty node part is provided. This is illegal.
I have been unable to recreate it, but both times it occurred when I was in the Add Contact dialog. The packet that was sent to the server was this.
My host is atacama