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As far as I understand a Block acts like an object, in that you can send copy or release messages to it, e.g: [myBlock copy]; However whenever I do this, or release a block, I get EXC_BAD_ACCESS. If I use the block functions, everything works as expected, e.g.: Block_copy(myBlock); I thought both ways of releasing and copying blocks were identical? It's not that much of a problem, but it is a little annoying that if I have a property (copy) which is a Block, I have to write the setter method myself. For example: With Properties: //Header @property (nonatomic, copy) void (^cancelledBlock)(void); //Implementation @sythesize cancelledBlock; leads to EXC_BAD_ACCESS when setting cancelledBlock but if I do: //Header @property (nonatomic, copy) void (^cancelledBlock)(void); //Implementation @sythesize cancelledBlock; //saves me doing the getter as well - (void)setCancelledBlock:(void (^)(void))aCancelledBlock { if (cancelledBlock == aCancelledBlock) { return; } void (^oldValue)(void) = cancelledBlock; cancelledBlock = Block_copy(aCancelledBlock); Block_release(oldValue); } there is no EXC_BAD_ACCESS and everything runs as it should.

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