Hi George,
Do you see any 1099 amounts in Vendor Maintenance on the 1099 Info tab for your 1099 vendors?
When you say "old 2012 database", is that the database that was upgraded?
If you have no 1099 data on the 1099 Info tab in Vendor Maintenance, and the vendors were properly set up as 1099 vendors prior to paying 1099 flagged vouchers, then you can rebuild 1099 data using the AP Integrity Check. However, if the vendors were not set with the 1099 Vendor set at Yes and a default box number identified, then you cannot rebuild the 1099 amounts since the vouchers were not properly identified as 1099 vouchers.
Let me know what you find.