ARC & Memory managment in my app?

This depends on what the ivar startScreen is. If startScreen is defined as a strong ivar in your view controller, then it will have a refcount of 1 after allocation, and a refcount of 2 after you set it as a subview in your view hierarchy. Then, removing the view from its superview will only reduce the refcount to 1 and you'll have to explicitly nil the variable to dealloc it.

If you would like more visibility into what's preventing your view from being released, you should Profile your app using Instruments' Allocations template. This will tell you the call site of every retain and release, including those performed by ARC and the system frameworks. If your views are being instantiated from a XIB file, to a certain degree, the system frameworks control their lifetimes.

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