Hmm, the only thing the console log tells us is that you didn't do a data install from the menu which is irrelevant all thing considered. I dunno much about the game itself but I played it for about an hour and a half and it worked fine so it seems like it's something on your end.
Seeing as you mention dialog boxes being a problem maybe you didn't download the proper fonts? PPSSPP has its own fonts but they're not 100% compatible with all PSP games. The reason for this is that Sony still holds copyright over PSP fonts so the PPSSPP crew can't legally ship the originals with the emulator.
You can find Sony's original fonts and what to do with them
here.