I have configured TWiki:Plugins.TagMePlugin
for "split web" use.
I have a subweb: Vicki/Test
topic (in the subweb) creates the tag without error, with the tag database maintained for the top level web. These tags are visible in the subweb.
each top level web has its own tag namespace, which is shared by its subwebs
create new tag
link on each page points to the page in the top level web. Given that the topics exist (and work) in the subweb, shouldn't the links point to those topics?