<randompageincategory cat="Featured articles" template="Template:FA" propreplace="$2" propreplacewith="fa_summary" replace="$1" parse="true" stripreftags="true"/>
Topic on Extension talk:BedellPenDragon
When trying to create this template I ge the blank screen.
Please follow the instructions at Manual:Errors_and_symptoms#You_see_a_Blank_Page so we can get more debugging information. Specifically, add the following lines to the LocalSettings.php file, underneath the <?php:
error_reporting( E_ALL ); ini_set( 'display_errors', 1 );
I changed the value of cat (Did you know?) to be the category I want to use. I saved the template and this was the resulting error message:
Fatal error: Call to a member function getText() on a non-object in C:\webapps\mtsitwiki\extensions\BedellPenDragon\BedellPenDragon.php on line 294
Go ahead and upgrade to the latest version and give it another try. The changes may or may not fix your problem; if not, keep coming back; we'll get it eventually. I would say, "Switch over to Semantic MediaWiki" but I don't think it has the capability you're looking for.
I ran into the same problem today and fixed it. That error was cropping up whenever the template page mentioned in the template parameter (template="foo") was nonexistent.