AllThingsD is reporting that updating school iPads to iOS 7 failed to restore the supervision profiles, meaning that all of the protective filters put in place were lost.

“Apple did not realize that installing iOS 7 would remove our (and thousands of organizations across the country) safety protection measure, which now makes the iPad devices unfiltered when accessing the Internet away from school,” said a memo from the Manitou Springs (Colo.) School District 14 to parents. “In the short term, the district will be collecting iPad devices at the end of each day until the safety protection measure is reinstalled” … 

From posts on the Apple Support Communities, the problem appears to be widespread. Some schools, whose iPads are still on iOS 6, are editing the school network DNS files to block access to the update server, preventing devices from downloading the update.

Apple says it is aware of the issue and is working on a fix.

“Some business and education users have reported that their supervised devices have reverted to unsupervised when they upgrade to iOS 7,” Apple spokeswoman Trudy Muller told AllThingsD. “We are aware of this issue, and will have a fix this month.”

Apple has so far issued two updates to iOS 7, with iOS 7.0.3 expected to be released shortly.

Last month, the LA School District decided to place a temporary halt on its plans to make iPads available to all of its 640,000 students after kids learned how to bypass the restrictions.