A new plugin for SolidWorks has been made available. It fixes a crash bug for SW 2012.
Download here:
KeyShot 4 w/ Live Linking
http://keyshot.com/install/plugins/solidworks/keyshot4_solidworks_plugin_2.1.exe
KeyShot 3
http://keyshot.com/install/plugins/solidworks/keyshot3_solidworks_plugin_1.6.exe