Thanks Klaus,

These modules are loaded by 3.0.4 but not by 3.0.4-64:
Code:
Module                  Size  Used by
arc4                     994  2 
lib80211_crypt_tkip     6273  0 
joydev                  6662  0 
wl                   1936903  0
and this module by 3.0.4-64 only:
Code:
Module                  Size  Used by
edac_core              30522  0
Reading around, I've found a post which advises
To make the module load at boot, add wl (and lib80211/lib80211_crypt_tkip, if needed) to your MODULES array in /etc/rc.conf
however on my system I don't have a /etc/rc.conf file. Should I create it, or do the module load instructions go elsewhere?