I have a simple test app with scene1 and scene2. Each scene has an image representing a button which I click to go to the other scene.

When scene one loads I check the memory usage. I then switch to scene2 and then back to scene1. I check the memory usage again and it has increased. Am I wrong to expect it to have returned to the origional value?

I am purging scenes and as far as I am aware removing and niling everything.

If you flick back and forth a few times does it continue going up or is it stable?

It gets to a stable level so there isn't a growing leak as such. I just wondered why it doesn't return to the origional level.

I am going through my app at the moment trying to remove leaks and to be honest I am failing to get a grip on the whole releasing memory thing.

This may provide an interesting/helpful read for you; http://blog.anscamobile.com/2011/08/corona-sdk-memory-leak-prevention-101/

Peach :)

Thanks Peach, I think I am doing everything in the article but I must be missing something.

I found that printing out the modules loaded in the unrequire function quite enlightening. It also helped me track down one leak where my level modules were not unloading.

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        function unrequire(m)
                package.loaded[m] = nil
                _G[m] = nil             
                table.foreach(package.loaded, print)
        end