Faced a similar problem. Contacts with the installed DR do not open for editing (error android.process.acore). In addition, when synchronizing with google, the DR of these contacts was cleaned and not transferred to google.
I can not say exactly what caused the problem, but the solution found the following:
1. Through standard Contacts, I export to a flash drive, I get a * .vcf file.
2. In all records, in the field DR (BDAY), I change the date from yyyymmdd to yyyy-mm-dd (for example, BDAY: 19740614 - BDAY: 1974-06-14).
3. Delete all contacts from the phone and import the edited file.
While everything works, including the normal synchronization of the DR with google. There is only one incomprehensible glitch, the date in the contacts is displayed correctly, but if you clip it to change, it opens for editing a day less, i.e. 06/14/1974 instead of 06/14/1974. After changing and saving everything falls into place.
Post has been editedjoyman17 - 23.10.11, 14:45