I think I've nailed this one.

When you're done with a pool, you now have to call drain() yourself, and before the thread that the pool was created on has finished. NSAutoreleasePools are special, please don't cast them, and we probably have an issue if they are returned from methods, as Rococoa will probably try to retain them. But for simple cases, I think that this should work.

If this has been affecting you, please update and give it a go.

Duncan