It appears both ways:
* Start gedit from launcher/dash/terminal and then double-click a text file in nautilus/archive manager gives a second instance.
* double-click a text file in nautilus/archive manager and then starting gedit from dash/terminal gives a second instance (not from launcher, though, which switches to the first instance correctly).
I still see the issue with Unit 3.8.12.
It appears both ways: dash/terminal and then double-click a text file in nautilus/archive manager gives a second instance.
* Start gedit from launcher/
* double-click a text file in nautilus/archive manager and then starting gedit from dash/terminal gives a second instance (not from launcher, though, which switches to the first instance correctly).