... and see the old revisions, as well ("created", but red).
Works without a problem for me. If you look at the index http://wiki.splitbrain.org/playground:test7.txt?do=index you will see there is no playground:test7.txt namespace, thus the red link. I added a second link and created the ns.test page and a test page inside this namespace. It works as expected.
Wow this gave me some headache. The problem is simple. There is a page called 'test7' inside the 'playground' namespace. In the filesystem this means there is the following file:
Now if you want to create the page 'playground:test7.txt:foo' it would mean to create
But creating the directory 'data/pages/playground/test7.txt' is not possible because there is already a file with that name.
This is a really rare edge case which occurs when you give your namespaces an .txt ending. There is nothing do about that without completely changing how DokuWiki stores its data.