I really like the extension from what I can read about it, but I can't seem to get it to work. Whenever I add SemanticRating to my mediawiki, I keep getting a blank page (no matter how often I update/reinitialise) I'm using mediawiki 1.28.0, SemanticMediawiki 2.4.5 and pageforms 4.0. Thanks in advance for anyone who points out my (probably obvious) error.
Topic on Extension talk:Semantic Rating
A blank page usually indicates an error on the server side. Have you checked your web server error log? It could be something as simple as a typo in your configuration file. Also, look at https://www.mediawiki.org/wiki/Manual:How_to_debug for some pointers on debugging.
Semantic Rating is installable on a 1.28 instance without issues. Make sure that you use Semantic Rating 4.0 and that you have Page Forms 4.x installed. Semantic Rating 3.0 will indeed either not register at all or cause a fatal.