J River Media Jukebox 12 & sansa clip

It can’t be J River Media Juke box can it but I had been using Winamp fine to sync ogg files when I though I’d give Media Jukebox a go and since then files sent to the clip will appear as unknown or not play at all and lock the clip up. I have checked for correct tagging of the files but this now happens with both the J River Media Jukebox and Winamp.