I suddenly remembered that I had set up the serial cable in a convenient location, so I decided to load up hyperterminal and check things. Here's the last section that hyperterminal displays:

[hijack] ERROR: : "dance=breakdance.raw; one of the "original" dances"
[hijack] ERROR: : "dance=princedance.raw; one of the "original" dances"
[hijack] ERROR: : "dance=stonkdance.raw; one of the "original" dances"
[hijack] ERROR: : "dance=AirTar.raw"
[hijack] ERROR: : "dance=Dafonze.raw"
[hijack] ERROR: : "dance=MoreDancing.raw"
[hijack] ERROR: : "dance=PoleDancer1.raw"
[hijack] ERROR: : "dance=PoleDancer2.raw"
[hijack] ERROR: : "dance=PoleDancer3.raw"
[hijack] ERROR: : "dance=TopPoleSpin.raw"
[hijack] ERROR: : "dance=ymca.raw"
khttpd: listening on port 80
kftpd: listening on port 21
player.cpp : 385:empeg-car 2.00-beta11 2002/02/08.
Prolux 4 empeg car - 2.1434 Feb 7 2002
Vcb: 0x4086d000
hijack_tone_init completed.

Seems pretty conclusive. What I don't understand is why the original poster got the error, even though he has no flancedoor lines.