Issue with dynamic images on an MVP 8400

I am having an issue with one set of dynamic images updating on a panel. The images are stored on the master under images/Weather.

I tested this on another system and it works fine but when I brought it to the master and touch panel in my office the images aren't updating correctly.

The only thing that differs are the following:

Test system:
NI 700 with latest duet firmware and device firmware
MVP 8400 with latest firmware

Send_Command dvPanel,"'^RMF-nav_weather_icon,%P1%U',sMasterUser,'%S',sMasterPass,'%H',sMaster,'%A',sMasterPath,'%F',sWeather.sIcon"

sMaster[15] = '192.168.001.200'		/// Change to correct master address
sMasterPath[16] = '/images/Weather/'	/// Change to correct image path
sMasterUser[13]='NetLinx'		/// Needed to update nav bar image
sMasterPass[8]='password'			/// Needed to update nav bar image

sWeather.sIcon = '44d.png'

Office system:
NI 3100 with latest duet firmware and device firmware
MVP 8400 with latest firmware

Send_Command dvPanel,"'^RMF-nav_weather_icon,%P1%U',sMasterUser,'%S',sMasterPass,'%H',sMaster,'%A',sMasterPath,'%F',sWeather.sIcon"

sMaster[15] = '192.168.042.200'		/// Change to correct master address
sMasterPath[16] = '/images/Weather/'	/// Change to correct image path
sMasterUser[13]='NetLinx'		/// Needed to update nav bar image
sMasterPass[8]='password'			/// Needed to update nav bar image

sWeather.sIcon = '44d.png'

The other dynamic images pulled from website are updating on both panels correctly. Any ideas?

TIA

Chris