Today's update (kernel and liblircclient0) did not help.

Here is some more info:

1/ Once the machine is booted, pluging in the USB receiver gives these kernel messages:
Aug 20 08:59:07 mediabox kernel: [  239.720022] usb 4-1: new full speed USB device using ohci_hcd and address 2
Aug 20 08:59:08 mediabox kernel: [  240.005357] lirc_dev: IR Remote Control driver registered, major 61
Aug 20 08:59:08 mediabox kernel: [  240.008696] lirc_mceusb: Windows Media Center Edition USB IR Transceiver driver for LIRC 1.90
Aug 20 08:59:08 mediabox kernel: [  240.008701] lirc_mceusb: Daniel Melander <email address hidden>, Martin Blatter <email address hidden>, Dan Conti <email address hidden>
Aug 20 08:59:08 mediabox kernel: [  240.190025] usb 4-1: reset full speed USB device using ohci_hcd and address 2
Aug 20 08:59:08 mediabox kernel: [  240.410275] lirc_dev: lirc_register_driver: sample_rate: 0
Aug 20 08:59:08 mediabox kernel: [  240.416263] lirc_mceusb[2]: Pinnacle Systems PCTV Remote USB on usb4:2
Aug 20 08:59:08 mediabox kernel: [  240.419260] lirc_mceusb[2]: usb reset config ret 0
Aug 20 08:59:08 mediabox kernel: [  240.419306] usbcore: registered new interface driver lirc_mceusb

2/ Sending an IR signal to the receiver with the remote gets me a OOPS from which the system does not recover. See picture attached.

3/ Once rebooted via a hard reset, unplugging the receiver gives the following kernel error message:
Aug 20 09:03:59 mediabox kernel: [   21.035348] usb 4-1: USB disconnect, address 2
Aug 20 09:03:59 mediabox kernel: [   21.036185] lirc_mceusb[2]: usb remote disconnected
Aug 20 09:03:59 mediabox kernel: [   21.036201] general protection fault: 0000 [#1] SMP
Aug 20 09:03:59 mediabox kernel: [   21.036348] last sysfs file: /sys/devices/pci0000:00/0000:00:10.0/0000:03:00.0/irq
Aug 20 09:03:59 mediabox kernel: [   21.036551] CPU 1
Aug 20 09:03:59 mediabox kernel: [   21.036604] Modules linked in: cryptd aes_x86_64 aes_generic binfmt_misc snd_hda_codec_nvhdmi ipt_MASQUERADE iptable_nat nf_nat ipt_REJECT ipt_LOG nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_conntrack nf_conntrack iptable_filter snd_hda_codec_realtek ip_tables x_tables nvidia(P) arc4 ath9k snd_hda_intel ath9k_common snd_hda_codec ath9k_hw snd_hwdep snd_pcm snd_seq_midi ath snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd mac80211 cfg80211 soundcore snd_page_alloc video psmouse lirc_mceusb shpchp output k8temp edac_core edac_mce_amd led_class i2c_nforce2 serio_raw lirc_dev usbhid hid b44 ssb mii firewire_ohci firewire_core ahci libahci crc_itu_t forcedeth
Aug 20 09:03:59 mediabox kernel: [   21.038451]
Aug 20 09:03:59 mediabox kernel: [   21.038491] Pid: 29, comm: khubd Tainted: P            2.6.35-16-server #22-Ubuntu K9N2GM-FIH(MS-7508)/MS-7508
Aug 20 09:03:59 mediabox kernel: [   21.038758] RIP: 0010:[<ffffffff811405ec>]  [<ffffffff811405ec>] kfree+0x5c/0x130
Aug 20 09:03:59 mediabox kernel: [   21.038964] RSP: 0018:ffff88021662dad0  EFLAGS: 00010206
Aug 20 09:03:59 mediabox kernel: [   21.039104] RAX: 00706e82f7000000 RBX: 201f1b2200000060 RCX: 000000000003ffff
Aug 20 09:03:59 mediabox kernel: [   21.039293] RDX: 00100fc991000000 RSI: 00705882f7000000 RDI: 201f1b2200000060
Aug 20 09:03:59 mediabox kernel: [   21.039482] RBP: ffff88021662daf0 R08: 000000000000f680 R09: 0000000000000000
Aug 20 09:03:59 mediabox kernel: [   21.039672] R10: 0000000000000000 R11: 0000000000000002 R12: ffffffff8107e6c9
Aug 20 09:03:59 mediabox kernel: [   21.039862] R13: 0000000000000002 R14: ffffffffa0109660 R15: ffffffffa01096c8
Aug 20 09:03:59 mediabox kernel: [   21.040052] FS:  00007f2151776700(0000) GS:ffff880001e80000(0000) knlGS:0000000000000000
Aug 20 09:03:59 mediabox kernel: [   21.040266] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Aug 20 09:03:59 mediabox kernel: [   21.040419] CR2: 00007f21511f2cc1 CR3: 0000000001a2a000 CR4: 00000000000006e0
Aug 20 09:03:59 mediabox kernel: [   21.040611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 20 09:03:59 mediabox kernel: [   21.040804] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Aug 20 09:03:59 mediabox kernel: [   21.040993] Process khubd (pid: 29, threadinfo ffff88021662c000, task ffff88021661adc0)
Aug 20 09:03:59 mediabox kernel: [   21.041207] Stack:
Aug 20 09:03:59 mediabox kernel: [   21.041260]  ffff88021662dae0 ffff880037829000 ffff880215c98240 0000000000000002
Aug 20 09:03:59 mediabox kernel: [   21.041465] <0> ffff88021662db10 ffffffff8107e6c9 0000000000000000 ffff880215c98e40
Aug 20 09:03:59 mediabox kernel: [   21.041683] <0> ffff88021662db50 ffffffffa01071fc ffffffffa0109660 ffffffffa01096c8
Aug 20 09:03:59 mediabox kernel: [   21.041906] Call Trace:
Aug 20 09:03:59 mediabox kernel: [   21.041973]  [<ffffffff8107e6c9>] kfifo_free+0x19/0x40
Aug 20 09:03:59 mediabox kernel: [   21.042115]  [<ffffffffa01071fc>] unregister_from_lirc+0x6c/0x130 [lirc_mceusb]
Aug 20 09:03:59 mediabox kernel: [   21.042313]  [<ffffffffa010736d>] mceusb_dev_disconnect+0xad/0xc0 [lirc_mceusb]
Aug 20 09:03:59 mediabox kernel: [   21.042509]  [<ffffffff8141cada>] usb_unbind_interface+0x5a/0x1a0
Aug 20 09:03:59 mediabox kernel: [   21.042671]  [<ffffffff81386595>] __device_release_driver+0x75/0xe0
Aug 20 09:03:59 mediabox kernel: [   21.042835]  [<ffffffff813866fd>] device_release_driver+0x2d/0x40
Aug 20 09:03:59 mediabox kernel: [   21.042998]  [<ffffffff813856b2>] bus_remove_device+0xb2/0xf0
Aug 20 09:03:59 mediabox kernel: [   21.043151]  [<ffffffff813833f7>] device_del+0x127/0x1d0
Aug 20 09:03:59 mediabox kernel: [   21.043291]  [<ffffffff81419168>] usb_disable_device+0xa8/0x130
Aug 20 09:03:59 mediabox kernel: [   21.043445]  [<ffffffff814127ed>] usb_disconnect+0xdd/0x180
Aug 20 09:03:59 mediabox kernel: [   21.043589]  [<ffffffff81412ea3>] hub_port_connect_change+0x93/0xa40
Aug 20 09:03:59 mediabox kernel: [   21.043754]  [<ffffffff81419eef>] ? usb_control_msg+0xff/0x180
Aug 20 09:03:59 mediabox kernel: [   21.043907]  [<ffffffff814149c2>] hub_events+0x332/0x580
Aug 20 09:03:59 mediabox kernel: [   21.044046]  [<ffffffff81598721>] ? schedule+0x3e1/0x830
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff81414c65>] hub_thread+0x55/0x190
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff8107df30>] ? autoremove_wake_function+0x0/0x40
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff81414c10>] ? hub_thread+0x0/0x190
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff8107d9d6>] kthread+0x96/0xa0
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff8100aee4>] kernel_thread_helper+0x4/0x10
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff8107d940>] ? kthread+0x0/0xa0
Aug 20 09:03:59 mediabox kernel: [   21.046084]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
Aug 20 09:03:59 mediabox kernel: [   21.046084] Code: 00 00 48 89 df e8 05 12 f0 ff 48 c1 e8 0c 48 be 00 00 00 00 00 ea ff ff 48 8d 14 c5 00 00 00 00 48 c1 e0 06 48 29 d0 48 8d 34 30 <48> 8b 06 66 85 c0 78 7e 84 c0 79 65 48 8b 4d 08 48 8b 7e 10 9c
Aug 20 09:03:59 mediabox kernel: [   21.046084] RIP  [<ffffffff811405ec>] kfree+0x5c/0x130
Aug 20 09:03:59 mediabox kernel: [   21.046084]  RSP <ffff88021662dad0>
Aug 20 09:03:59 mediabox kernel: [   21.111957] ---[ end trace 48dc368a49e9a31c ]---

Let me know if you need any more information.