Out of memory errors + Autosave Q

[Nxdt]

So recently I have been getting a lot of "Algodoo is out of memory, file cannot be saved". This is probably algodoo running out of available RAM and since i only have 2GB and i'm usually working on a substantial scene at the time. So i ask the question, is the autosave function still in algodoo? Or is it just onexitsave (Which will work, just restart algodoo and save as soon as your scene appears so you don't lose your scene) the only autosaving feature.

Also, when doing a lot of undo/redos with a complex scene, not all geometries will reload, and will be permanantly deleted, why is this?