Went through the fontbook clean up process described above. Repaired permissions (both from within running system and recovery volume). Removed all 'lost' fonts in Font Explorer (current version), cleared font caches (app & system). So far, nothing is working. All three apps are still crashing. Still have iWork 09 apps in a separate folder, so I'm not dead in the water, but I definitely can't run the new ones.
All other new and updated apps are running fine
Have the Permission "Fetching..." issue in Get info panels for my UID
Manually changed permissions of Keynote to include myself with read/write permissions. No change.
Also started without Font Explorer and only system fonts active, still crashing.
Checked ID in Terminal, and all seems to be as it should be
uid=501(username) gid=20(staff) groups=20(staff),12(everyone),61(localaccounts),79(_appserverusr),80(admin),81( _appserveradm),98(_lpadmin),402(com.apple.sharepoint.group.1),33(_appstore),100( _lpoperator),204(_developer),398(com.apple.access_screensharing),399(com.apple.a ccess_ssh)
Stumped.