Bomb Factory Plugins won't work on MIX System.

[Balanced Jack]

I've just migrated to version 6, having until now run everything on 5.1.3 under OS9.2.2

My setup is G4 Desktop 1Ghz Dual Processor, 768MB RAM, OSX 10.3.4, MIX3, 888/24, USD, ProTools 6.4.1cs2, iLok, Quantegy FHD (Firewire) 120GB Audio Drive.

I installed OSX 10.3.4 on a brand new, ATA4, HFS+ formatted drive (with no partitions) and made all the necessary System Preference changes as recommended by Digi.

Everything's running perfectly except... none of my Bomb Factory Plugins will work.
I downloaded the latest versions for MIX (version 4.2) according to Digi's site.
My iLok authorizes them fine.
But when I try to use them I get an 'error -7204' not enough DSP message, even when I am using no other plugs, on a session containing either 1 stereo or mono audio track (I've tried it at 44.1 & 48khz), and my 'System Usage' is just showing two Mix Engines (64 voice) and the 24bit Mixer.

Frustrating.

Anyone any ideas!?

[Seeee]

I imagine there is a set oh HTDM/HD plugs and one for Mix (44.1/48k). I remember seeing something about that when i downloaded the demos a while back.