For viewing details or editing contacts, I used to touch the contact in the contact list. This does not work anymore, instead it produces following output on stderr/out: "file:///opt/maemo/usr/share/kde4/apps/kaddressbook-mobile/kaddressbook-mobile.qml:297: TypeError: Result of expression 'itemModel.typeForIndex' [undefined] is not a function." This is true for Contact Groups, too.
Broken in version 4:4.5~20100827.1168757-1maemo1.1169941 .
Fixed in revision 1169979.
Confirmed, works fine in 4:4.5~20100903.1171290-1maemo1.1171237 .