The flip-down hatch on the side of the original MacBook 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 Macbooks.[52][53] 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 150 °F (66 °C) 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.[54][55] The problem is aggravated by system-intensive tasks such as video playback or video chatting