UILabel with iOS Storyboard: I can set the text explicitly, but introduce stringWithFormat: can't set text - nsstring

Question

This is a weird one. I've got a label on my storyboard in a custom prototype cell whose tag is 102. As the subject title suggests, I can set the text of the label in various ways and it appears on the device as expected. Here are the methods I've tried that work:
nameLabel.text = #"My buddy's name";
nameLabel.text = [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"];
[nameLabel setText:[[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]];
These, however, don't work...
NSString *nameString = [NSString stringWithFormat:#"game with %#", [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]];
[nameLabel setText:nameString];
also...
[nameLabel setText:[NSString stringWithFormat:#"game with %#", [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]]];
and...
nameLabel.text = [NSString stringWithFormat:#"game with %#", [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]];
I need for the cells to read: "game with so-and-so" where "so-and-so" is the opponent's name, obviously. Any ideas as to what would cause this?
EDIT: So here's some more code, demonstrating how I'm attacking this thing:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MatchCell"];
UILabel *nameLabel = (UILabel *)[cell viewWithTag:102];
...
}
if (indexPath.section == 0) {
nameLabel.text = [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"];
[nameLabel setText:[[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]];
NSString *nameString = [NSString stringWithFormat:#"game with %#", [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]];
[nameLabel setText:nameString];
[nameLabel setText:[NSString stringWithFormat:#"game with %#", [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]]];
nameLabel.text = [NSString stringWithFormat:#"game with %#", [[self.matchArray objectAtIndex:indexPath.row] valueForKey:#"player2Username"]];
}
return cell;
}
I'm using Parse as my BaaS. There really doesn't seem to be a problem there, as I can retrieve, log, and display on my iPhone (in the cell) the player's username and any other data I want, as long as I don't incorporate stringWithFormat:.
I tried cleaning the project and the build folder, uninstalling from the device, etc. Re-ran it. Still no luck.

Answer 1

Newb mistake. I didn't size the UILabel wide enough to accommodate the extra text. That is to say I could explicitly set a string (e.g. nameLabel.text = #"player name";) and there was enough room to fit the player's name, but whenever I tried to prepend "game with " to any user's name, it had the effect of making the entire string too long for the small width of the UILabel to accommodate. So, I guess it was reverting to the text of the label (which I had set in Interface Builder/Storyboard), "game with...".
In a nutshell, be sure you make your UILabels wide enough to accommodate the text they're going to be handling, kids! If you don't, someone's gonna wind up with a disease or pregnant or worse. I've seen it a thousand times.