can't run multiple delta 8mm or 8mm & st on 3/e

[Webster Dove]

Last week, we installed the delta micro software for there 8mm on our 3/e
server.  The kernel is configured for

controller      se0 at vme24d16 ? csr 0x300000 priority 2 vector se_intr 0x40
tape		st0 at se0 drive 32 flags 1
disk		sd0 at se0 drive 0 flags 0
disk		sd1 at se0 drive 1 flags 0
disk		sd2 at se0 drive 8 flags 0
disk		sd3 at se0 drive 9 flags 0
tape		smt0 at se0 drive 40 flags 4
tape		smt1 at se0 drive 48 flags 4

The machine boots, and smt0 works.  However if I try to access either st0
or smt1, the kernel gets a bus error.  Has anyone else had problems with
the delta micro driver when configured for several drives?