Hi fordey33,
Sorry to hear that you lost your strategies. You should always exit software by using X button or logout button.
If you are using latest version of V3, 3.0.8, then you can use option "Import from auto backup file" to import last saved backup of your strategies. Here is screenshot:
http://screencast.com/t/3ZBuPWAIn4
Latest V3.0.8 is automatically saving backups of your strategies. For this to work option "Automatically backup strategies on exit when save is done (maximum one backup per day)" must be ticked:
http://screencast.com/t/EN9dTwWe
Beside this you should always create your own backup of strategies to file after you make changes to them.
Regards,
Rade