i've been using zxing.net.mobile for scanning qr codes on an iphone 4s and it works very well, but today i tried my app on an iphone 5 (two different ones, two different iOS versions) and both had problems -- when i cancel the scan it takes a long time to return to my screen and then if i try to scan again it takes a long time to come up and doesn't have the camera window.
I have to kill the app to get it to work again. I assume there is something failing or hanging during the cancel that prevents the app from getting the camera the next attempt, but haven't looked into the guts of the zxing code yet.
Has anyone seen anything like this?