The latest version of Cobook was perfect for me. I am glad I didn't upgrade Cobook on my iPhone yet. Now only my iPad misses a good contact management app.
The old tags are no longer usable. I decided to create new tags the way they are in full contact. First I created the tags, then I selected contacts by shifting them left. 'Add a tag'. The tag was added and Full Contact crashed. Now it does not open anymore, it crashed right away.doing an operation on all results of a search is not possible, every contact has to be shifted left first.
At the bottom of the selection bar I chose to add a tag to the selected contacts. After that, FC crashes,also after I closed the app and after a reboot. Now it is useless.