Using Vim's persistent undo?

Question

One of the new features in Vim 7.3 is \'persistent undo\', which allows for the undotree to be saved to a file when exiting a buffer.

Unfortunately, I haven\'t quite

Answer 1

I suppose $HOME doesn't work as advertised.

On my system, :echo $HOME shows H:\, but : e $HOME/ says: ~/ invalid filename.

You could try with an absolute path to see whether it cures it