There is a problem with the map of3a1b.bsp in Half-Life: Opposing Force. Looks like that this map was based on c4a1.vmf from Half-Life (the first map of the Xen chapter), and an old chapter title C4A1TITLE (meaning "XEN" in valve\titles.txt) was not removed while modifying a map.
There is a problem with the map of3a1b.bsp in Half-Life: Opposing Force. Looks like that this map was based on c4a1.vmf from Half-Life (the first map of the Xen chapter), and an old chapter title C4A1TITLE (meaning "XEN" in valve\titles.txt) was not removed while modifying a map.
In-game example: