I'm now confronted with the same problem.
Semantic MediaWiki could not be found at [1] (either the page Special:Version was not found at all, or SMW's version could not be determined from that page).
Product Version MediaWiki 1.24.0 PHP 5.3.28 (apache2handler) MySQL 5.0.95
Version shows the following:
Semantic extensions Extension Version License Description Authors Semantic Bundle 1.9.2 A pre-packaged bundle of Semantic MediaWiki related extensions Yaron Koren, Jeroen De Dauw and others Semantic Maps 3.0.4 License Provides the ability to view and edit coordinate data stored with the Semantic MediaWiki extension Jeroen De Dauw Semantic MediaWiki 1.9.2 License Making your wiki more accessible - for machines and humans (online documentation) Markus Krötzsch, Jeroen De Dauw, James Hong Kong and others
I tried version 2.0; same problem
In addition to this, Maps doesn't seem to work: [2]
The wiki registry is depending on the SMW version and probably setup related factors more or less broken since SWM 1.5.6 There are bugs for this but so far this was not a big priority.
Thanks you for the registry related answer.
Any idea why http://drebbel.net/wiki/DrebbelsPlaces doesn't work? Seems related to parser-hooks. SMW test works fine however.