Just installed Google Maps 4.0 yesterday -- works AWESOME on my i920, gps lock within 30 seconds when outside. Unfortunately still no navigation like they have on the newer android devices (grr, google bastadz!) but it most certainly does not crash.
What ROM are you using, and did you uninstall the older version manually before installing the new one? Also try using SKTools' uninstaller -- that will also scan for left behind registry keys \ temp\cache files and remove them.
Samsung Omnia 2 WM6.5 Stock - Verizon Wireless
[x] HTC Polaris
[x] HTC Apache