[minstrel]

You said you created a small backup - did you just backup the PDFs? The smart buttons are stored in the MobileSheets database, so just copying the PDFs is not enough. You have three options for backing up your data:

1) Create a full library backup under Settings->Backup and Restore->Backup Library.
2) Sync to a cloud folder using Sync Library->Sync to a cloud folder
3) Copy the database file under /storage/emulated/0/Android/data/com.zubersoft.mobilesheetspro/files which is named mobilesheets.db (if you use the Switch Library feature, there is one .db file per library). 

I generally recommend creating periodic library backups using Settings->Backup and Restore->Backup Library, as that will contain your entire library in one file.

Mike

Thanks Mike!  I'm back on track and yes, Option 1 works and is the way to go.  No doubt my lost 'smarties' was a spinoff from that 'FastSpring' issue from a while back.