Road Hog 4.21 + HPU + Nano Hog - Connect to Show Issue

v5.01 (b135)

Road Hog 4.21 Net 1. Nano Hog Net 2. HPU Net 11. 

Road Hog 4.21 as server: Launch Show on Road Hog. All OK. HPU connects and is On Line. All OK.

Nano Hog tries to connect to show: 'Hog Start' splash screen disappears momentarily then just re-appears. Ad infinitum.

If I Launch Show on the Nano Hog, that is OK. HPU connects and is On Line. All OK.

Road Hog tries to connect to show. Process starts and then freezes before it has completed connecting. The desktop is frozen. I cannot even re-start the desktop. I have to switch the desk off.