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Installing a theme using the tweak tool and the user theme extension succeeds (installing the theme using the zip in the tweak tool UI), and it appears in the Drop down. However, when trying to select the theme, it does not apply it to the interface. (even after a forced restart of the shell). Similar behaviour when you manually place the theme directory in ~/.local/share/theme/. It shows up in the tweak tool interface, but does not apply when chosen there from the dropdown. Note also, that themes that are installed via yum, (e.g. gnome-shell-theme-orta) do work fine.
This issue was originally mentioned in an ask fedora question: https://ask.fedoraproject.org/question/3842/gnome-shell-themes-wont-change
the themes are copied to ~/.local/share/themes by the tool and do not work if selected. If I copy them to ~/.themes everything works as expected.
It looks like the GNOME Shell user theme extension only loads user themes from ~/.themes, whereas GNOME Tweak Tool deploys them in ~/.local/share/themes. The user-theme extension should also rely on the default XDG base directory to load themes. An bug report will be sent upstream. Meanwhile a fix update will be soon available for GNOME Tweak Tool.
gnome-tweak-tool-3.8.0-3.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/gnome-tweak-tool-3.8.0-3.fc19
Package gnome-tweak-tool-3.8.0-3.fc19: * should fix your issue, * was pushed to the Fedora 19 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing gnome-tweak-tool-3.8.0-3.fc19' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-12602/gnome-tweak-tool-3.8.0-3.fc19 then log in and leave karma (feedback).
gnome-tweak-tool-3.8.0-3.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.