1. How come the incompatible update was installed on my system? Doesn't
Ubuntu automatically do incompatibility detection?

No. Once you enable a PPA with untested software, you are on your own.

2. Why is gdk-pixbuf incompatible, if it is not in the list of the
packages that were updated and thus caused this issue?

Because glib2.0 changed things that gdk-pixbuf was depending on I would
guess.

3. I already tried (prior to submitting this bug) to downgrade the
packages I installed but had no luck. The reason is that package
dependencies force me to remove hundreds of packages in my system that
depend on the packages I want to downgrade.

You can remove packages installed by a PPA with the ppa-purge command:

$ sudo ppa-purge ppa:webupd8team/gvfs-libmtp


I am closing this bug, since the problem is caused by incompatible software in 
a PPA.

** Changed in: gtk+3.0 (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1295220

Title:
  Images can't be viewed system-wide after libgtk3 update

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