My experience was the opposite -- on first opening the page, it properly displayed the number of available generations. After I logged in, when I entered a prompt and clicked the button to generate a song it would dump me back to the main page and display 0 tries. With that said, I tried it out again and was able to generate a song with a different prompt. I think what I was experiencing yesterday was that the AI was rejecting my prompt (likely due to content?) and instead of displaying an exception or error message stating such, it just did the behavior I described in my first paragraph.

The frontend doesn't seem to work. Login is required to generate a song, and while you are supposedly able to generate 5 songs on the free tier, whenever I did so it would just redirect me back to the main page with the generation counter showing I had 0 remaining.