"An unexpected problem has been discovered in the version of Rhythm Thief that was available yesterday on the Apple App Store," Sega informed Joystiq. "We have removed it temporarily from the store as we work on a fix.
"Our development team is hard at work to update the game and it will be back online very soon. Anyone who has purchased the game already will be able to play it as soon as it is back. We will keep you updated and we thank you in advance for your continued patience."
If you've already purchased The Paris Caper, the news doesn't get any better. We tried to load the game up today, only to be greeted with a maintenance message that wouldn't let us get past the title screen. Unlike the original 3DS game the iOS adaptation requires an online connection to play, so players won't be able to sneak in offline.
It has to be said, it's not been the best of capers for Sega so far. Hopefully a fix is due sooner rather than later, and we'll keep you updated on any further developments.
Update: Rhythm Thief & The Paris Caper is back on the App Store and playable once more.