@Diogo_Baeder, I just checked the AUR Insync page, and the maintainer has deleted the fontconfig symlink: https://aur.archlinux.org/packages/insync/
@Diogo_Baeder, you’re not the only user to have problems with the 1.4x updates. Everything seemed to be working without problem for me before I accepted the 1.4 updates. I’m considering downgrading to 1.3.
I don’t know if this will help your specific situation since I’m not using Gnome, but in my Manjaro MATE the Insync fontconfig isn’t linked to /usr/lib (which is the same version fontconfig as your downgrade):
$ pacman -Qi insync | grep -i vers
Version : 1.4.4-3
$ ls -lh /usr/lib/insync/libfontconfig.so.1
-rw-r–r-- 1 root root 268K Mar 20 01:21 /usr/lib/insync/libfontconfig.so.1
$ pacman -Qi fontconfig | grep -i vers
Version : 2.12.6+5+g665584a-1
$ pacman -Qi mate-desktop | grep -i vers
Version : 1.20.0-1
I don’t have PySide installed.
But then again, there seems to be a regression in Insync 1.4 because it’s forced me to revert to changing the QGtkStyle GUI to anything besides GTK+ (using qtconfig-qt4, per this Insync Forum post from April 2017: https://forums.insynchq.com/t/insync-wont-start-on-manjaro-with-mate-desktop/8910/6).
Again, everything was working without issue for me prior to the updates to the 1.4.x versions of Insync.