Another observation: This problem is not limited to Nautilus. Thus going back to Nautilus 3.26.0 will not help.
==Steps to reproduce for other apps==
1) Open nautilus
2) click on the nautilus entry in the top bar (left of "activities".
3) Select "Help"
4) nautilus exits, yelp doesn't come up
5) open polari
6) click on the "Polari" entry in the top bar (left of acitivies.
7) Select "Help"
8) See polari crash
9) Open gnome-control-center
10) See that gnome-control-center will exit/crash, see that yelp doesn't come up
Not all applications crash. Most applications don't offer the possibility to open yelp from the top bar. So those are not mentioned in the list below:
1) Deja Dup, Gnome control center, Nautilus, Polari, Gnome-Disks, Gnome-Photos, gEdit and gnome-logs will crash
2) Gnome Terminal, Rhythmbox, Gnome-Sudoku, Cheese, Gthumb, Gnome-Mahjongg, Gnome-Mines, Simple-Scan, Gnome-Calculator and Gnome-Clocks, File Roller, gnome-screenshot, baobab, gnome-system-monitor and Totem will not.
Another observation: This problem is not limited to Nautilus. Thus going back to Nautilus 3.26.0 will not help.
==Steps to reproduce for other apps==
1) Open nautilus center center will exit/crash, see that yelp doesn't come up
2) click on the nautilus entry in the top bar (left of "activities".
3) Select "Help"
4) nautilus exits, yelp doesn't come up
5) open polari
6) click on the "Polari" entry in the top bar (left of acitivies.
7) Select "Help"
8) See polari crash
9) Open gnome-control-
10) See that gnome-control-
Not all applications crash. Most applications don't offer the possibility to open yelp from the top bar. So those are not mentioned in the list below: monitor and Totem will not.
1) Deja Dup, Gnome control center, Nautilus, Polari, Gnome-Disks, Gnome-Photos, gEdit and gnome-logs will crash
2) Gnome Terminal, Rhythmbox, Gnome-Sudoku, Cheese, Gthumb, Gnome-Mahjongg, Gnome-Mines, Simple-Scan, Gnome-Calculator and Gnome-Clocks, File Roller, gnome-screenshot, baobab, gnome-system-