This is the desk top viewer I have.
I checked updates and it says it is up to date.
In walk mode, page up/down do nothing for me.
With walk mode off (fly) it is like an elevator - straight up or down.
'V' is down and 'R' is up - but again only when walk mode is off.
Gamer mode (only works with full screen active) and walk mode are mutually exclusive.
Turn gamer mode on and walk mode is inactive.
Then only the left/right, forward/backward (WASD or arrow keys) work - no elevate up/down.
But I don't have a game controller connected, so not sure if there is a way to fly with that - but I don't think so, there is nothing in the help manual.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10