From an email from David Boroditsky...
"Something to keep in mind when you upgrade the hardware (I got bit by this bug when upgrading a publishing client from Frontier 4 to Frontier 10)...
The new versions of the Frontier App won't work properly on Intel Macs if your software relies on sending AppleEvents. There is an-endian related bug that means you have to either run the app under Rosetta or use an older version of the app."
... at < http://tech.groups.yahoo.com/group/frontierkernel/message/3372 >.