I've installed last version (8.1.18) and have a problem when updating some records.
I've 1500 contacs (imported from csv file). There are several records (with the more or less the same data) that I can't update because I get the error: Invalid ID. return to home page.
I'm just using fields: firstname, lastname, address, home and fax.
It's strange because other records with the same fields filled I get a success message when updating.
Is there something missing in my installation?