I recently updated Ubuntu Gnome 15.04 to 15.10 and lately I'm having a weird problem: when having two Files windows side by side, I double-click to open a folder in one window, and it opens... in the other window. No new window, no new tab. Just changes one window to the folder I'm trying to open in the other one.
Seems quite random, and hard to reproduce, but happened several times already. Anyone experiencing the same?