I'm not sure what else it would be unless it has to do with the 5 string which I only have a 4. And I haven't been able to get it to work on standard A tuning. Not many songs of that sort though. I have had one or two songs that for some reason it didn't work but for the most part it has. Maybe someone else will have an aswer for you. Good luck!
Sorry if I'm just stupid but I D/L the latest version of toolkit but can't find a button or selection that says "Low Bass Tuning Fix". I haven't tried creating any customs so I am unfamiliar with the process but would like to play some songs that I can't get my tuning down for. Any help would be greatly appreciated! Thanks!