I recorded an append for my utau, and then tried to get it to play on utau. A message then popped up on UTAU saying something about the wav, but it was in japanese so I just shrugged it off. I then went ahead and oto'd it, and after trying to play it, it the same message popped up. Finally, I aliased it and it still didn't play and the same message popped up. This also happened in UTAU-Synth, and the voicebank won't load onto there. All of my files are wav, start with a lowercase letter, are aliased and oto'd, and they all have .frq files, so I'm not sure what happened. If you want, I can show you a screenshot of the message that pops up on regular UTAU and UTAU-Synth.