Same here: I solved the issue #4 described, by following instructions in #5.
Thanks to you all.
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https://bugs.launchpad.net/bugs/1622880
Title:
nautilus crashes on Ubuntu 16.10
To
To me it happens also with Totem and during the playback of Internet
flash videos.
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https://bugs.launchpad.net/bugs/1080847
Title:
Screensaver not disabled during video playback
To
I think I've found some sort of a solution to the problem:
http://forums.fedoraforum.org/showthread.php?t=269183
Installing the xscreensaver solved the issue for me. I haven't restarted yet,
but I think it'll keep working after that.
I'm using GNOME 3.6, by the way.
Hope this helps you solving
