Hello -
I've just installed Semantic MediaWiki, and all seems to have gone smoothly (i.e., the Special:version page shows that 0.7 of the software was installed.)
But when I run the 'Testing your Installation' checks (from http://svn.wikimedia.org/svnroot/mediawiki/trunk/extensions/SemanticMediaWiki/INSTALL ), I run into a problem.
Specifically - this is not working for me:
Create a regular wiki page named "TestSMW", and in it enter the wiki text
  Relation test:  [[testrelation::Dummypage]]
  Attribute test: [[testattribute:=dummyvalue]]

when you preview and save the page, the SMW "Factbox" should appear showing the
relation Testrelation to Dummypage and the attribute Testattribute with a warning
(since you haven't given it a type).

Rather, I simply get a classic 'The page cannot be displayed' error.
Does anyone have any suggestions as to what the fix might be here ?
I'm wondering about the following install note:
If you have your own custom namespaces, you have to set the parameter $smwgNamespaceIndex  before
including SMW_Settings.php.
... and whether that using Template: pages means that I need to take this step. 
Any advice is most appreciated.
Thanks !