OK Got it.....
On RC6 (formatted config filesystem)
BBL of E39 only = OK
BBL of T43 only = OK
BBL of E39 & T43 = $0281 No Data
I don't have access to an E38&T43 ATM so I can't check if it's controller specific or combining controllers that causes issue.
I grabbed a trace from just after the $0281 error.
USR_2304.zip
Simon.