Quote - jeez, this was already at the bottom of the page today!  well, anyway, sunbeam, what happens when ya unmount and turn off the leopard disk, then try to run poser 8.app from main HD of G5 tower? is any software like "little snitch" installed?

?little snitch?
I installed Poser on the main drive (Tiger) and it was only after finding it rather sluggish that I decided to instal it on Leopard as well.

Quote -
p.s. whilst P8 may not a 64-bit app, leopard and snow leopard are both able to access 8 GB. altho one would question how one could jam all those into a G5.  4 slots at 512 MB each would be default IIRC.

This G5 has eight slots all capable of taking 1Gb.

Activity Monitor:
On Tiger:
Poser 7: real memory 192Mb virtual memory 680 Mb threads 1
poser 8: real 153Mb  virtual 818Mb  threads 10
on Leopard:
poser 7: real 205Mb virtual 1.2Gb threads 2
Poser 8: real 190Mb virtual 1.32Gb threads 11