> My IIcx has no such problem.
> 
> I've found that by adding and removing non-essential drivers (changing the
> size of the kernel, effectively), I can make this problem go away and
> reappear.  I haven't had any luck tracking it down, so far.

This sounds like the same problem I'm having with SCSI when I change the
size of the video driver. It seems that certain device drivers might want
to be at certain offsets in memory.

Could this be a compiler/linker problem?