Soft SampleCell + ATTO Problem

[Vinylizor]

I've just spent a day cleaning up the G4. Wiped system HD, installed 9.2.2 and reinstalled all software.
At the same time I installed a new extra IDE drive for backup and re-initialised 2 18gb Cheetahs (Glyph rack on Atto dual SCSI card ) with Express ProTools 2.3.2.
Everything is up and running great, except Soft SampleCell - the extension is crossed out on startup, and when you try and run it you get a "can't find SampleCell hardware, try restarting" message. It used to work fine on this system before my cleanup.
The only way to get it running is to restart with the Glyph turned off - then it works fine. Answerbase mentions several conflicts with hardware and other extensions but in this case none of it helps.
As the 2 Cheetahs are now blank I'm presuming it must be a conflict with the Atto HD drivers.
Anyone any ideas ?

G4 500DP
Digi 7 slot expansion chassis
Miro DC30+
Atto dual scsi
2 X 18Gb Cheetahs in Glyph rack
3 X Mix, 1 DSP Farm card
PT 5.1.1