Chromium refuses to start

[SOLVED] Had to clean up / partition by running pacman -Sc. Everything works fine now!

After updating today, Chromium now refuses to start. Only Firefox will start. When I try to start Chromium through a terminal, it says this:

[3058:3058:750272686:ERROR:process_singleton_linux.cc(940)] Failed to create socket directory.
[3058:3058:750273413:ERROR:browser_main.cc(1403)] Failed to create a ProcessSingleton for your profile directory.
This means that running multiple instances would start multiple browser processes rather than opening a new window in the
existing process. Aborting now to avoid profile corruption.

None of the items that updated today could have affected Chromium as far as I know except for, possibly, linux updating to 3.1.4-1. Here is the relevant info from my pacman.log file:

[2011-12-01 15:19] Running 'pacman -Syu'
[2011-12-01 15:19] synchronizing package lists
[2011-12-01 15:19] starting full system upgrade
[2011-12-01 15:28] upgraded lame (3.99.2-1 -> 3.99.3-1)
[2011-12-01 15:28] upgraded libdvdnav (4.1.3-2 -> 4.1.3-3)
[2011-12-01 15:28] upgraded libiec61883 (1.2.0-2 -> 1.2.0-3)
[2011-12-01 15:28] upgraded mkinitcpio (0.8.0-1 -> 0.8.0-2)
[2011-12-01 15:29] >>> Updating module dependencies. Please wait ...
[2011-12-01 15:29] >>> Generating initial ramdisk, using mkinitcpio.  Please wait...
[2011-12-01 15:29] ==> Building image from preset: 'default'
[2011-12-01 15:29]   -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux.img
[2011-12-01 15:29] ==> Starting build: 3.1.4-1-ARCH
[2011-12-01 15:29]   -> Parsing hook: [base]
[2011-12-01 15:29]   -> Parsing hook: [udev]
[2011-12-01 15:29]   -> Parsing hook: [autodetect]
[2011-12-01 15:29]   -> Parsing hook: [pata]
[2011-12-01 15:29]   -> Parsing hook: [scsi]
[2011-12-01 15:29]   -> Parsing hook: [sata]
[2011-12-01 15:29]   -> Parsing hook: [filesystems]
[2011-12-01 15:29]   -> Parsing hook: [usbinput]
[2011-12-01 15:29] ==> Generating module dependencies
[2011-12-01 15:29] ==> Creating gzip initcpio image: /boot/initramfs-linux.img
[2011-12-01 15:29] ==> Image generation successful
[2011-12-01 15:29] ==> Building image from preset: 'fallback'
[2011-12-01 15:29]   -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-fallback.img -S autodetect
[2011-12-01 15:29] ==> Starting build: 3.1.4-1-ARCH
[2011-12-01 15:29]   -> Parsing hook: [base]
[2011-12-01 15:29]   -> Parsing hook: [udev]
[2011-12-01 15:29]   -> Parsing hook: [pata]
[2011-12-01 15:29]   -> Parsing hook: [scsi]
[2011-12-01 15:29]   -> Parsing hook: [sata]
[2011-12-01 15:29]   -> Parsing hook: [filesystems]
[2011-12-01 15:29]   -> Parsing hook: [usbinput]
[2011-12-01 15:29] ==> Generating module dependencies
[2011-12-01 15:29] ==> Creating gzip initcpio image: /boot/initramfs-linux-fallback.img
[2011-12-01 15:29] ==> Image generation successful
[2011-12-01 15:29] upgraded linux (3.1.3-1 -> 3.1.4-1)
[2011-12-01 15:29] upgraded weechat (0.3.6-1 -> 0.3.6-2)
[2011-12-01 15:29] upgraded xmlto (0.0.24-1 -> 0.0.24-2)

Any ideas on what is going wrong? I've had this happen once before, but I just switched to Firefox for a while until YouTube broke on it and then I went back to a, completely working, Chromium.