Saved songs disappear

When we type new songs in OLP at times it shows that the song is saved and you can add it to the order of service. Later on however when you try to open the song it has no lyrics and you can not find the song in the database if you try to re add it to the order of service

Very unusual, not had reports like this before. Which version of openlp are you running, which version of Windows and are you logged in as a normal user or an administrator?