Chris Eckert at Funnybook Babylon has revealed the reason All Star Batman #10 was recalled by DC Comics. It appears it was a printing issue. WARNING: The following clip contains the scans of the objectionable material. They also are a spoiler of the issue.
The reason behind All-Star Batman & Robin the Boy Wonder’s recall revealed! The censor bars didn’t print properly a whole bunch of times! Cusswords are visible! Look out! Don’t click through if you don’t want to see Batgirl being super-sassy:
The Beat delivered the details on why the "black bars" didn't work:
In an email Nat Gertler speculated the production error:
“Just having looked at scans over the Internet, it looks to me like the lettering is printed using just black ink, while the bars were put on a different layer using “rich black”, which is a mixture of all four color inks. “Rich black” makes a darker, more vibrant black. On the computer screen, it would all just look black, but the difference will be visible on the printed page.”