Upg from 2004 to 2015 - upg database error

SOLVED

I am upgrading a very large database from 2004 to 2015. The slips are below the required 300,000 and the backup that I am working from was taken after a data verification (which returned no errors) after everyone else had gone home. 


While the upgrade goes from 2005 to 2006, after updating all the slips I get the error below in the log and Timeslips then restores the backup it took before the conversion.

ERROR INFORMATION
-----------------
Class: tBDETableExceptionC
Code: 109
Area: Table
Too many record locks on table.
Exception tBDETableExceptionC in module Timeslip.exe at 00A9B44F.
Table: Report
Record: n/a
BDE Code: 9485

There seems to be a lock, but where? Nothing is accessing the database other than the conversion process.

My trouble is that, because this database is so large it takes about 8hrs for the conversion to get to this point. We would like to get this up and running in time for the new year but, as you can appreciate, people are away over Christmas. This means I don't have a lot of time for trial and error.

Do you have any suggestions I can try?