US-based shoppers who bought the new JK Rowling novel have been hit by a glitch that made it difficult to read.
A formatting problem meant that when The Casual Vacancy was downloaded to some e-readers it could only be viewed in a large size that showed a limited number of words per page, or in tiny-sized type.
The publisher, Hachette, has released a fixed version.
But many users who had pre-ordered the title will have been affected.
The novel topped several ebook charts ahead of its release due to high interest in JK Rowling’s first novel for adults, following the success of her Harry Potter series.
A statement from Hachette acknowledged that it was responsible for the fault which prevented font and margin sizes being adjustable.
“As soon as Hachette was made aware of these issue, a replacement file was uploaded to all ebook retailers,” the publisher said in a statement.
“Hachette has requested each retailer contact their customers directly about reloading their ebook.
“Any consumer who purchased the ebook on Thursday… who has not heard from the retailer, should contact them and request that their ebook be reloaded. No consumer should have to repurchase the ebook.”
The Casual Vacancy’s UK publisher, Little Brown, confirmed that users in the country had not been affected.
Several users – some of whom had already taken issue with the ebook’s $17.99 (£11.22) pre-order price – complained about the error on ebook store review pages.