panel settings not loaded on startup

After upgrading from Xubuntu 13.03 to Xubuntu 13.10, upon startup panel settings not loaded.
In particular, in applications window no title bar is present: to make it appear I always have to go into panel preferences menu.
Once the panel prefecence appear, the title bar shows up, even if a don't touch anything in the panel preference window.
It seems that just opening panel prefecence widow, make setting to be correctly reloaded.
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ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: cavarretta 1328 F.... pulseaudio
DistroRelease: Ubuntu 13.10
HibernationDevice: RESUME=UUID=083b7871-6d81-4072-9d17-623f00e776fa
InstallationDate: Installed on 2012-04-28 (682 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
MachineType: Compaq Presario 061 PJ458AA-ABZ SR1169IT IT430
MarkForUpload: True
Package: linux (not installed)
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic root=UUID=2a132dfa-2ed1-40ba-891e-62a058322baa ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-18-generic N/A
 linux-backports-modules-3.11.0-18-generic N/A
 linux-firmware 1.116.2
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
Tags: saucy
Uname: Linux 3.11.0-18-generic i686
UpgradeStatus: Upgraded to saucy on 2013-10-17 (144 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 07/09/2004
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 3.09
dmi.board.name: Kelut
dmi.board.vendor: ASUSTek Computer INC.
dmi.board.version: 2.02
dmi.chassis.type: 3
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr3.09:bd07/09/2004:svnCompaqPresario061:pnPJ458AA-ABZSR1169ITIT430:pvr0y^0411RE101KELUT10:rvnASUSTekComputerINC.:rnKelut:rvr2.02:cvnHewlett-Packard:ct3:cvr:
dmi.product.name: PJ458AA-ABZ SR1169IT IT430
dmi.product.version: 0y^0411RE101KELUT10
dmi.sys.vendor: Compaq Presario 061