iOS 7 fails on the following demo:
The first time the rows are rendered right. When the app is restarted, the items are not rendered right. This also happens with sections. I have attached two images, showing before close and after opening for a second time.
Inserting or resetting the model does not seem to help.
This happens on both devices and simulator. It does not matter whether it is compiled with iOS sdk 6.1 or 7.
Android has no problem handling the same case.