I am having the same problem but i am using SQL-Server as data source, so i know it is not indexes. when i use burrermode 5 (table buffering) a TABLEUPDATE(.T.) causes a fatal VFP error C000005. With a .T. parameter tableupdate() writes all records. All the records in the cursor are newly appended before i commence with the tableupdate(). I can issue TABLEUPDATE() (with no .T.) so it will update only the current record. I can do this one record at a time. When i get to the last record i get the fatal error. It does not matter which record is the last one i write out. I can skip around the table (even starting with the last reocord first) issuing tableupdate() once i get to the last one i get the error. I am using VFP 7 W/sp1 SQL-Server evalualtion edition and ODBC connection.