When editing a date I get the error message:
Index does not match the table. Delete the index and recreate the index 76 REPPUSH.
I have closed and reopened, run the optimise, re-index and validate options, these do not solve the problem.
My search by id number does not list the records in numeric sequence.
My guess is that this has been caused by merging projects and then merging data sets.
Typically, the numbers (higher numbers) of merged records appear at the top of the list.
This did not happen (at least to me) in version 6.