Files disappear when closing utool

Hi there.

Currently waiting on delivery of a LP-16 and am getting our files ready for use. I’ve manged to set everything up OK in utool, played back through the mixer and export to a USB drive. All seems to work fine until quitting out of utool – all the audio, song files and playlists disappear. This has now happened twice on an iMac and once on Windows 7. NB the audio doesn’t move to trash / recycle bin etc – it just disappears completely and isn’t moved elsewhere from what I can see. Thanks.