Just another warning for those who have NOT backed up their User Libraries at all, or recently, as I have seen numerous reports of this , and it finally happened to me....   PSA : backup you User Library Folder Now !  found here :   C:\Documents\Chief Architect Premier X13 Data\Database Libraries   you can copy and paste the file back into the folder then change the extension to .bac to do this simply.   but would suggest a more pr