Hello... i'm new here and i just know the existence of PPSSPP just a few hours ago, since everybody on the forum said this game was unplayable so i'm gonna report that this game was
working using :
Title: Hatsune Miku Project DIVA 2nd
Format: ISO
Version: - v0.7.5-14-g17a3b75
- v0.7.6-1437-gad4b2ea-windows-x86
OS: Windows
Compatibility: Perfectly Playable, all game elements has work
note : yes it was a translated english version on the SC but i also tried the raw JP version and it also works fine...
note2 :
it feels kinda slow to me on the gameplay as everytime a press a key it feels kinda late nope it's just my gamepad having a delay -15ms
note3 :
just notices some minor things. character's eyes was blinking way too fast and there's some vertical lines on the difficulty star at a screen before playing the song(which is not supposed to be there)fixed by disabling frameskip, buffered rendering, and vertex cache
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been a long time i haven't checked this thread. I was struggling myself by playing Project Diva (1st) until achievement 100% (i only got 89% though) use the game data and unlocked some free costumes for miku <3
thanks to latest build and atrac3+ the Opening Video now available with sound!
but the crashing problem is not yet fixed, everything is blank and freezes that the option by pressing esc button didnt even appeared. 
just find out that on Diva room music box and after entering MP3 Music Playback menu I cant press any button except L button. the only solution was to reset the PPSSPP 
this caused from memstick folder transfered from old builds and JPCSP and solved by removing that folder. strange though why that folder affect the whole PPSSPP that folder also cause the latest build to crash (not happening to 0.7.6 public release)
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here's some screenshot for those..