Tekken 6

[The Phoenix]

on PPSSPP 0.8.1 Windows 64 bit it freezes on the main menu. Suggestions? Thanks

Have you tried latest Git build which is now at time of writing this: v0.8.1-147-g6ce949a - it has a 64bit version ready & waiting for you to try.
At this location: http://buildbot.orphis.net/ppsspp/index.php

if you still have same problem, go to Settings / System / Untick Lock PSP CPU Speed - And try this, as the game DID not like being forced to run at higher CPU Speeds of which I found when i edited the PPSSPP.ini file to CPUSpeed = 666 instead of CPUSpeed = 0.
The game runs as smooth as silk now.