@mcostan A new setting is used, nothing is lost
I will check if we can do some conversions before the final. In the meantime your user should tick a checkbox.
the “Line starting at X did not follow iCalendar/vCard conventions” issue on zash1958’s system was caused by a contact with multi line additional information (NOTE property in vcard). Could you please check if you have such contacts and if possible to edit the additional information to be in one line and see if it solves the issue?