Thanks a lot for your response! And thanks a lot for your hints to 'leaks'.
I tried it, but I don't see any "ROOT CYCLE" in the output of 'leaks'. (I see a bunch of ROOT LEAKS, but in total it's just 6 kB.) Also, in the Debugger of Xcode, when i click on "Debug Memory Graph" icon, I get lots of graphs, but none of them shows a cycle. Same when I double-click the memgraph file: I can select all the memory graphs that go through CGImage, but none of them contains a cycle (and most of them don't originate in my code). And, yes, I do release the images using CFRelease() - but, of course, still thanks for the thought! ( I also switched on MallocStackLogging, but that did not provide more info on potential causes for the massive leak, of course.) Still stymied, Gab.
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