I run MOS PUP on my A4000, but I have unsuccessfully gotten OWB (v1.7) to load.
I have a fresh install of MOS 1.4.5 with update pack and MUI4 (beta from 2007). When double clicking the OWB icon I get some disk activity for a little while, then nothing. No errors or anything. It is not supposed to work on my setup? Or probably just too slow for anything anyways.
No, it should work (even if i haven't tested it myself for a long time on such a setup). It would first open a window showing font indexation progress (which can take a while at first run), and then the main browser window.
Anyway, run snoopdos to see where it could fail. And if you suspect it crashed, run getramdebuglog command and get the resulting logfile.