All of your recipes and profiles should be in the .../Documents/BeerSmith2 folder. Make sure you are logged in as the correct user. Second, look to see if that folder has been either sent to trash or quarantined by anti virus or malware prevention software.
If it's still missing, make a backup of that folder.
In that backup folder, find: Recipe5. double click.That'll be the oldest backup that BeerSmith performed. It updates this each time BeerSmith is closed.
Couble click the Recipe5 file, it should automatically open BeerSmith.
Just highlight all of them and copy/paste them into the new folder that BeerSmith created when it opened.
If your recipes are there, then do the same with the equipment, mash and other profiles you've created. You can open these with File > Open File > [Backup BeerSmith Folder]/Filename5.