No USB automount? Try booting with no devices attached.
After spending a few hours (OK, more than a few) tracking down why my USB drives weren't automatically being mounted by nautilus I eventually tried a clean install. This didn't fix it. However, when I compared my Maverick VM and my Maverick laptop the main difference was the presence of a USB mouse and keyboard that had been plugged in since the install.
I unplugged them, and everything that didn't work now worked (Disk Utility aka palimpsest). After a reboot automounting also worked again.
For more, see here:
1) MSI GT70: i7-3650, 16GB, GTX680M, XFCE@Manjaro-x64
2) Dell Studio 1749: i5-540, 8GB, ATi 5650, Intel 5300AGN XFCE@Manjaro-x64
3) Lenovo X61: C2D T7200, 2GB, Intel HDA, iwlwifi, XFCE@Manjaro-x64-OpenRC