Instagram won't save photos to my camera roll?

After I updated my iPhone 4S to iOS 6, the first time I opened my instagram app, a thing popped up that said "allow instagram to access your photos?". I clicked don't allow because I didn't know what it meant. In the past, whenever I took a photo, it just automatically saved to my photo library on my phone. Now it won't. I checked my settings in instagram & they're both set to "on" under save to camera roll. I tried restarting my phone. I tried deleting & redownloading the app. I tried on both Wi-Fi & 3G. It still won't work.

I did the same thing with Twitter & Facebook. Go to your settings, then photos & turn the feature for Instagram, Twitter or Facebook on. This allows the applications access to your photos & allows you to save photos to your camera roll.

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