Are there Application.persistentDataPath gotchas for Wii U?

I have an asset that uses Application.persistentDataPath and I've gotten a message from a user saying that it goes completely awry when run on Wii U. I'm not doing anything exotic (just saving a couple of files), so I'm at a loss as to what the issue might be. But they say the problem doesn't present on other platforms, so I'm pretty sure it's Wii U related. Unfortunately, I don't have a Wii U to test on.

Does anyone know if there are differences in saving files to Application.persistentDataPath on Wii U?

Thanks!