Found it! When running it on the simulator with Instruments the GeneralBlocks are reported as a single GeneralBlock-0. Searching through the web it seems that there is a bug in instruments objectAlloc reporting and QuartzCore.
So I just added a Memory Monitor instrument and saw that even though my Object Allocation kept growing non-stop, my Real Memory remained flat (well, moving up/down within half a MB)
I hope it's useful info to others, I spent a day searching for GeneralBlock-24 & 48 trying to figure it out until deciding to run it in the simulator just for the heck of it
dhomes
2009-08-15 10:38:27