I tried using tap tempo and when I clicked "Ok" it changed my BPM to NaN and will not allow me to change it back. I tried using both tap tempo and manual input but the BPM remains as NaN.
Sorry for the delayed response. I have identified the issue and will work on a fix. in the meantime if you email support with the name of the song that is messed up we can also fix that for you.
I still experienced the bug, is that anything that I can do?
I noticed this bug when I first started using Hookpad. I just tried several attempts and couldn't replicate the behavior - maybe a fix was applied but your song data is in a bad state? Did you try emailing support like Dave mentions?