nope, couldn't be caused by that. Its something I've never seen before, the connection credentials to access the site changed. The only way that makes sense to me is FTP adjustment of the config.php file. In order to fix it I needed to use root credentials to access the database and give it back the password that was set for your account. Mystery.
I just uploaded a brand new audio for a profile after but when I listen or download the track, I don'y hear any watermark ( even though I set the watermark feature to "module active" prior to creating the "audio" item