The default look and feel breaks visual compatibility in Mustang
One of the requirements imposed on the default Ocean theme was to Not Break Stuff. So now adjustments were made to the l&f which would have broken existing applications; the sizing of widgets is the same and everything should just work out of the box; it's just the skin of that l&f that's different (and, I think you'll agree, better) (quoting Chet's original post).
Here are the screenshots of the same exact application under Tiger 5.0_08 and Mustang 6.0_b98:
Digging in the code of the
MetalLookAndFeel locates this suspicious entry:
which appears to be the result of fixing this bug. So, somebody suggested making this change for Metal as well, and now the default echo char is 2 pixels wider...
Don't be alarmed if one of your forms will become a little garbled :)