NagVis Maps Not Displaying Host Names

[rj-admin2]

Hi All,
I've just been through the Nagios XI 2026R1 -> Nagios XI 2026R1.2 upgrade. What i have found is that my NagVis map (or any map for that matter) does not display host name labels. Other than that the map is fine. Has anyone else experienced this and is it fixable without downgrading. I've had a look at the contents of the map cfg file and it contains very little:

define global {
sources=automap
object_id=0
show_in_multisite=0
width=3500
line_color=#FEDC00
zoom=164
overlap=scale
iconset=std_area
render_mode=undirected3
margin=125
label_width=auto
label_show=1
label_x=center
label_y=bottom
}

I've also cheecked permissions:
/usr/local/nagvis/etc/maps# ls -l
total 40
-rw-rw-r-- 1 www-data www-data 362 Feb 26 04:54 demo-automap2.cfg
-rw-rw-r-- 1 www-data www-data 302 Feb 26 04:54 demo-automap.cfg
-rw-rw-r-- 1 www-data www-data 260 Feb 26 04:54 demo-geomap.cfg
-rw-rw-r-- 1 www-data www-data 1958 Feb 26 04:54 demo-load.cfg
-rw-rw-r-- 1 www-data www-data 1824 Feb 26 04:54 demo-msp-srv1.cfg
-rw-rw-r-- 1 www-data www-data 899 Feb 26 04:54 demo-nyc-racks.cfg
-rw-rw-r-- 1 www-data www-data 646 Feb 26 04:54 demo-overview.cfg
-rw-rw-r-- 1 www-data www-data 1639 Feb 26 04:54 demo-us.cfg
-rw-rw-r-- 1 www-data www-data 224 Feb 26 04:54 demo-worldmap.cfg
-rw-rw-r-- 1 www-data www-data 232 Feb 26 06:35 LF_Infrastructure.cfg

I've run the map using Dev Tools, but can't see anything.

TIA.