This one is funky :)
On the data view details page, the HTML content that contains the favorites links had a small error in the links it was building. Instead of 'page/{{ Page.Id }}?', I changed it to 'reporting/dataviews?', which is the correct page route to the page with the blocks to view the data views.
<h4><span class="label label-default"><i class="fa fa-star"></i> My favorite Dataviews:</span></h4>
{% assign favs = CurrentPerson | GetUserPreference:'MyFavoriteDVs' | Split:'|' %}
{% for fav in favs %}
{% assign valid = fav | Size %}
{% if valid > 0 %}
{% dataview where:'Id == "{{ fav }}"' %}
<a href="/reporting/dataviews?DataViewId={{ dataview.Id }}&ExpandedIds=C{{ dataview.Category.Id }}">{{ dataview.Name }}</a><br />
{% enddataview %}
{% endif %}
{% endfor %}
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