The Chinese-made taptic engine, which mimics the sensation of being tapped on the wrist, proved to be defective so Apple switched to a different supplier, according to The Wall Street Journal.
Competition Chief Margrethe Vestager says she doesn't want to rush a decision in investigations to determine whether Apple and other companies violated European Union tax rules.
The patent may hold up the launch until December, when it expires, according to Swiss broadcaster RTS.
A much-rumored 12.9-inch iPad won't go into production until the fall, sources tell Bloomberg.
A dissection of the watch by researcher IHS shows that a relatively low cost for parts could add up to more money for Apple.
The company says it needs more time to file its quarterly report because certain computer systems won't be back online until next month.
The PlayStation 4 was due to go on sale there this coming Sunday, but Sony is still negotiating with authorities.
Revenue in China helps boost the company to a record second quarter, but the iPad remains a weak spot for Apple.
The patent -- which ensures the design for the Apple Watch cannot be copied by a competitor -- was filed in August of last year, just weeks ahead of its unveiling.
FCC Chairman Tom Wheeler, who had promised to deliver proposed new rules for managing Internet traffic, may be finding the task more complicated than anticipated, The Wall Street Journal reports.