As reported by Anselm here: https://sourceforge.net/p/xowa/discussion/general/thread/fd6965cd/
The #deg2dd parser function is included with Extension:Mapsources. It is ultimately responsible for placing the red dot on the map.
XOWA doesn't currently implement Extension:Mapsources. I looked at the code and it's mostly simple, but long. I'll try to implement this for a v1.1 release.