User graphics is stored here by default - c:\Users\<logged user>\AppData\Roaming\SolarWinds\NetworkAtlas\Maps\Orion\<hostname or IP of orion server>\NetObjects\User Graphics\
Try to copy it to similar folder on your second machine.
User graphics is stored here by default - c:\Users\<logged user>\AppData\Roaming\SolarWinds\NetworkAtlas\Maps\Orion\<hostname or IP of orion server>\NetObjects\User Graphics\
Try to copy it to similar folder on your second machine.