The flip-down hatch on the side of Mac Book Air is a tight fit for some headphone plugs and USB devices, requiring users to purchase an extension cable. Apple has removed the flip-down hatch on the Late 2010 model in favor of open connection ports as on other Mac books. Since the release of the first-generation product, some MacBook Air users have complained of overheating that caused CPU lockup. The effect can be seen at CPU temperatures as low as and worsens with higher temperatures. Apple released a software update in early March 2008 to fix the problem with mixed results: the deactivation of 1 CPU core appears to have been corrected; however, the runaway kernel problem remains for at least some users. The problem is aggravated by system-intensive tasks such as video playback or video chatting.