Comment 16 for bug 978296

The change suggested in the following comment on GitHub solved the problem for me without having to edit the database:

Cannot edit tags under 'Categories and Tags' #206
https://github.com/projecthamster/hamster/issues/206#issuecomment-103143461

Just change the following line in the "preferences.ui" file for Hamster on Ubuntu 16.04:

$ cd /usr/share/hamster-applet/
$ diff preferences.ui.old preferences.ui
607c607
< <property name="expand">False</property>
---
> <property name="expand">True</property>

Line 607 is found just after the "tags_frame" object:

<object class="GtkFrame" id="tags_frame">
  ...
</object>
<packing>
  <property name="expand">True</property>
  <property name="position">1</property>
</packing>