"Invalid access to memory" in local system root

I get an "Invalid access to memory" error if I go back all the way to the root of the local system drive (C) with the latest version (4.1.7)

It also messes up the fonts like this:
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How do you "go back all the way", if that matters?

Backspace, backspace, backspace, ... :)

I'm not able to reproduce that.

I'll send you a debug version soon.