Still seeing the same on a fresh up-to-date oneiric install. By hovering over the volume widger (sound applet):

Dec 31 16:07:05 margrietmyth-desktop kernel: [ 2944.840173] unity-panel-ser[1472]: segfault at 10 ip b7239ee6 sp bff2b8f0 error 4 in libgdk-3.so.0.200.0[b7210000+76000]
Dec 31 16:07:07 margrietmyth-desktop kernel: [ 2946.932139] unity-panel-ser[2043]: segfault at 10 ip b73cfee6 sp bfac9d00 error 4 in libgdk-3.so.0.200.0[b73a6000+76000]
Dec 31 16:07:09 margrietmyth-desktop kernel: [ 2949.326932] unity-panel-ser[2086]: segfault at 10 ip b7296ee6 sp bf88b180 error 4 in libgdk-3.so.0.200.0[b726d000+76000]
Dec 31 16:07:13 margrietmyth-desktop kernel: [ 2952.838129] unity-panel-ser[2135]: segfault at 10 ip b7347ee6 sp bfac3260 error 4 in libgdk-3.so.0.200.0[b731e000+76000]
Dec 31 16:07:20 margrietmyth-desktop kernel: [ 2959.859890] unity-panel-ser[2179]: segfault at 10 ip b72aeee6 sp bf902130 error 4 in libgdk-3.so.0.200.0[b7285000+76000]
Dec 31 16:07:22 margrietmyth-desktop kernel: [ 2962.357575] unity-panel-ser[2232]: segfault at 10 ip b7303ee6 sp bfb3b950 error 4 in libgdk-3.so.0.200.0[b72da000+76000]
Dec 31 16:07:26 margrietmyth-desktop kernel: [ 2966.339295] unity-panel-ser[2276]: segfault at 10 ip b729eee6 sp bfe06df0 error 4 in libgdk-3.so.0.200.0[b7275000+76000]
Dec 31 16:10:04 margrietmyth-desktop kernel: [ 3123.884687] unity-panel-ser[2321]: segfault at 10 ip b733cee6 sp bfa39450 error 4 in libgdk-3.so.0.200.0[b7313000+76000]
Dec 31 16:10:07 margrietmyth-desktop kernel: [ 3126.928675] unity-panel-ser[2431]: segfault at 10 ip b7251ee6 sp bf96be70 error 4 in libgdk-3.so.0.200.0[b7228000+76000]
Dec 31 16:10:10 margrietmyth-desktop kernel: [ 3130.357973] unity-panel-ser[2462]: segfault at 10 ip b7217ee6 sp bfec8820 error 4 in libgdk-3.so.0.200.0[b71ee000+76000]
Dec 31 16:10:12 margrietmyth-desktop kernel: [ 3131.677999] unity-panel-ser[2476]: segfault at 10 ip b731dee6 sp bf98c660 error 4 in libgdk-3.so.0.200.0[b72f4000+76000]
Dec 31 16:10:17 margrietmyth-desktop kernel: [ 3137.230259] unity-panel-ser[2482]: segfault at 10 ip b7339ee6 sp bfb52fc0 error 4 in libgdk-3.so.0.200.0[b7310000+76000]
Dec 31 16:11:42 margrietmyth-desktop kernel: [ 3221.703898] unity-panel-ser[2496]: segfault at 10 ip b721dee6 sp bfbd0370 error 4 in libgdk-3.so.0.200.0[b71f4000+76000]
Dec 31 16:11:43 margrietmyth-desktop kernel: [ 3223.430570] unity-panel-ser[2613]: segfault at 10 ip b728eee6 sp bfbb7040 error 4 in libgdk-3.so.0.200.0[b7265000+76000]
Dec 31 16:11:53 margrietmyth-desktop kernel: [ 3232.942814] unity-panel-ser[2627]: segfault at 10 ip b71eeee6 sp bf825a70 error 4 in libgdk-3.so.0.200.0[b71c5000+76000]
Dec 31 16:11:55 margrietmyth-desktop kernel: [ 3235.431155] unity-panel-ser[2641]: segfault at 10 ip b732aee6 sp bfafa5c0 error 4 in libgdk-3.so.0.200.0[b7301000+76000]
Dec 31 16:13:44 margrietmyth-desktop kernel: [   35.345619] unity-panel-ser[1547]: segfault at 10 ip b7396ee6 sp bfa180b0 error 4 in libgdk-3.so.0.200.0[b736d000+76000]
Dec 31 16:13:47 margrietmyth-desktop kernel: [   38.255389] unity-panel-ser[1726]: segfault at 10 ip b73d8ee6 sp bfd40600 error 4 in libgdk-3.so.0.200.0[b73af000+76000]
Dec 31 16:13:49 margrietmyth-desktop kernel: [   39.803785] unity-panel-ser[1732]: segfault at 10 ip b73b8ee6 sp bfc04b90 error 4 in libgdk-3.so.0.200.0[b738f000+76000]
Dec 31 16:13:50 margrietmyth-desktop kernel: [   41.131219] unity-panel-ser[1738]: segfault at 10 ip b71feee6 sp bffd6430 error 4 in libgdk-3.so.0.200.0[b71d5000+76000]
Dec 31 16:14:31 margrietmyth-desktop kernel: [   81.992496] unity_support_t[1870]: segfault at 3 ip 08048ed2 sp bfd225e0 error 4 in unity_support_test[8048000+3000]
Dec 31 16:16:44 margrietmyth-desktop kernel: [  215.135283] unity-panel-ser[2059]: segfault at 10 ip b7223ee6 sp bfb5a050 error 4 in libgdk-3.so.0.200.0[b71fa000+76000]
Dec 31 16:16:45 margrietmyth-desktop kernel: [  216.592536] unity-panel-ser[2476]: segfault at 10 ip b72cdee6 sp bf91e7e0 error 4 in libgdk-3.so.0.200.0[b72a4000+76000]
Dec 31 16:16:55 margrietmyth-desktop kernel: [  226.589174] unity-panel-ser[2495]: segfault at 10 ip b7304ee6 sp bfbea090 error 4 in libgdk-3.so.0.200.0[b72db000+76000]
Dec 31 16:17:51 margrietmyth-desktop kernel: [  282.463010] unity-panel-ser[2546]: segfault at 10 ip b732aee6 sp bfad0030 error 4 in libgdk-3.so.0.200.0[b7301000+76000]
Dec 31 16:17:54 margrietmyth-desktop kernel: [  284.962557] unity-panel-ser[2671]: segfault at 10 ip b7352ee6 sp bfb4d2d0 error 4 in libgdk-3.so.0.200.0[b7329000+76000]
Dec 31 16:17:56 margrietmyth-desktop kernel: [  287.039434] unity-panel-ser[2695]: segfault at 10 ip b7363ee6 sp bfbdd540 error 4 in libgdk-3.so.0.200.0[b733a000+76000]
Dec 31 16:45:00 margrietmyth-desktop kernel: [ 1911.043763] unity_support_t[3251]: segfault at 3 ip 08048ed2 sp bfa04a00 error 4 in unity_support_test[8048000+3000]

Luckily my keyboard has working volume buttons.