Maybe the explanation (and the confirmation of the portable version limits at this moment) :Multiple instances - #11 by HarSel
I unserstant that the "portable version" is a "desktop version" with little modifications. And since the "new instance" capacity (3.3.3 version), the second instance has the behaviour of a classical desktop version and create something on C: !!! Something completly empty !
So we musn't use linking with 3.3.3 at this moment because it a kind of mess.