Same problem encountered on Ubuntu 12.04 and 12.10 on computers running LXDE but otherwise with very different configurations.
I found a possible patch on the LXDE Sourceforge butracker: http://sourceforge.net/tracker/index.php?func=detail&aid=3427598&group_id=180858&atid=894869
Using this, and updating it for current lxpanel git head, I've now got a working lxpanel.
Same problem encountered on Ubuntu 12.04 and 12.10 on computers running LXDE but otherwise with very different configurations.
I found a possible patch on the LXDE Sourceforge butracker: http:// sourceforge. net/tracker/ index.php? func=detail& aid=3427598& group_id= 180858& atid=894869
Using this, and updating it for current lxpanel git head, I've now got a working lxpanel.