Why isn't my edit contact working?

I'm displaying a list of Contacts, and have a context menu to Edit Contact by calling an intent. On some contacts it works fine, but on others the Edit Contact activity is blank. Any ideas?

Here is the cursor...

 projection = new String[]{ContactsContract.CommonDataKinds.Phone.NUMBER,ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone._ID};   
 uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
 cursor = getActivity().getContentResolver().query(uri, projection, null, null,    ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC");

Here is the code from my CursorAdapter.getView() ...

textView.setText(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)) ;

And here is the code from my onContextItemSelected...

cursor.moveToPosition(position);
String idContact = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
Intent i = new Intent(Intent.ACTION_EDIT);
i.setData(Uri.parse(ContactsContract.Contacts.CONTENT_LOOKUP_URI + "/" + idContact));
parent.startActivity(i);

I've checked logcat and can see

I/ActivityManager(  102): Starting activity: Intent { act=android.intent.action.EDIT dat=content://com.android.contacts/contacts/lookup/23356 cmp=com.android.htccontacts/.ui.EditContactActivity }

but no error messges

Try this:

Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
Cursor cursor = this.getContentResolver().query(uri, null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC");
long idContact = cursor.getLong(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.CONTACT_ID));

then

Intent i = new Intent(Intent.ACTION_EDIT);
Uri contactUri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, idContact); 
i.setData(contactUri);