Thread:Extension talk:MsCalendar/no wiki markup parsed after usage line

I have installed this extension on my Mediawiki 1.20 and for whatever reason, wiki markup text fails to load anywhere after I use the calendar usage text. Sections, regular text, even categories do not render if inserted below the calendar line. Kind of frustrating since the calendar works flawlessly otherwise. The markup text does remain, it simply doesn't render. Details on my environment are below, thanks.

Product 	Version MediaWiki 	1.20.3 PHP 	5.3.3-7+squeeze19 (apache2handler) MySQL 	5.1.66-0+squeeze1

Hardware: VMware Virtual Machine v.7 - Single Processor - 2048MB Memory - 20GB Storage Operating System: Debian Squeeze 6.0.6