Santiago and Roberto,
I have started a bug report for this issue relating to the xfce-panel here:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688
I also have been having similar problems in Xubuntu 12.04, 12.10, 13.04, 13.10. Pressing ALT+TAB does bring Matlab and other java windows back onto the panel but this is very annoying especially when you are using several different windows.
Santiago and Roberto,
I have started a bug report for this issue relating to the xfce-panel here:
https:/ /bugs.launchpad .net/ubuntu/ +source/ xfce4-panel/ +bug/1192688
I also have been having similar problems in Xubuntu 12.04, 12.10, 13.04, 13.10. Pressing ALT+TAB does bring Matlab and other java windows back onto the panel but this is very annoying especially when you are using several different windows.