I use UITableView with static cells.
If I use reloadData, than everything is OK.
If I try reloadRowsAtIndexPaths it hides row. Row appears if I drag tableView up-down(when cell is updated).
I had the same problem, it seems to be a bug. I experimented some and the problem doesn't occur when I set the animation option to UITableViewRowAnimationNone. Some other interesting stuff happens when you set that option to UITableViewRowAnimationTop, too.