Hi Wayne,

re:
> This is an error on the current version of the Node Editor that happens when pressing "Load" then "Cancel".

I investigated this some more and it turns out that it is not a bug in the Node Editor, it is a bug in MoI's file dialog handling. The bug crept in with a change a couple of betas ago to remember the last used file dialog directory so the dialog will start out in that directory. It ends up returning that directory name when you cancel when it should be returning an empty string.

The node editor code is already checking for an empty string like it should.

I've got it fixed up for the next v4 beta, thanks for reporting it.

- Michael