Hi Yelsavick,
Picking a renderer is only relevant when you use the "Internal" mode. It is likely that most RPGMaker games do not use any common renderer, so in that case you have to use the "Attached" mode.
However, reading your last sentence, it seems like your hotkeys are working in the game? In that case, it could be anything from a peculiar font to some alignment bug. I am releasing a new update tomorrow with a better OCR engine for English, Chinese, Japanese and Korean. Hopefully it will solve your issues.
Is the game you are playing free to try so that I can test it for myself? :)
Just to confirm that it is indeed the OCR engine being unable to pick up the text, and not misalignments, you could launch the "Desktop" mode and run your game in windowed mode.