Hi,
I am using:
ii 4:4.11.3-0ubuntu0.1~ubuntu13.10~ppa amd64

I export a Google-contact from kaddressbook and get the file "testvcard.vcf" 
When I import this VCF into a DAV-Recource (owncloud) the Contact is never synced to Owncloud. 
But if i delete the UID line from the "testcard.vcf" and import the contact to the DAV-Resource, then the contact will be synchronised!! --> Correct 

This only happens if I import the contact into the DAV-Resource in kadressbook. 

More: If I Import the contact in owncloud ("with" OR "without" the UID), then the contact is synced to kadressbook, and I can edit it in kadressbook and it will be synced back to the owncloud-DAV-Recource. 

Need any more Info, then I will try to help.
Greetings Eugen

Reproducible: Always

Steps to Reproduce:
1. Import the "testvcard.vcf" in Kadressbook

Actual Results:  
Log into the webclient of "owncloud" and go to Contacts. The Contact will never be there

Expected Results:  
Log into the webclient of "owncloud" and go to Contacts. The Contact will show up (and will be synced from Kadressbook)

Content of the test-File "testvcard.vcf" - and yes: the Linefeed and " \" (Space+Backslash) in the filed "UID" is correct. This is exported from kadressbook out of a google-contact-resource.

BEGIN:VCARD
FN:Mustermann Jasmin
N:Mustermann;Jasmin;;;
NAME:Mustermann\\\, Jasmin
TEL;TYPE=CELL:01787203722
UID:http://www.google.com/m8/feeds/contacts/tanarri75%40googlemail.com/base
 /4105ff60d891cad
VERSION:3.0
X-GCALENDAR-GROUPMEMBERSHIPINFO:http://www.google.com/m8/feeds/groups/tanar
 ri75%40googlemail.com/base/6
END:VCARD