Also tested in gamemaster mode as well, same thing happens.

I have done further testing, I think it may be more reproducable.
I notice this most often happens when entering a vehicle, and then interacting with the vehicle cargo.
Suggested steps.
Enter vehicle, and drive
Open inventory, and swap some items around to/from the cargo area.
Exit the vehicle and test you can reload weapons, swap weapons or pick up /drop items.

I am trying this, not working for me either. Sometimes holding the shift key or alt key allows some changes with the mouse wheel, but it is both erratic in effect and direction, with the mouse wheel randomly causing the frequency to rise or fall, regardless of wheel movement direction, and it is nigh on impossible to set a desired frequency.

Looks like they fixed this in 0.99 :-)

Video example (for some reason I can't get this to play now)

This would be really useful. It would allow to switch from tracers trto AP rounds for instance, or swap HE to flares for night illumination. Doing it through the inventory is haphazard and if you have more than one type of mag/shell there is on consistancy as to which one is picked currently.

Tested all these variations with the same result.
Running server on Mac Pro hardware (Booting as windows 11)
Running server on Alienware 17R4 (Running windows 11)
With Mods
Without Mods
Conflict Everon
Conflict Arland
Playing as Russian side
Playing as US side
Reinstalled server and client from scratch on the Alienware.
Reinstalled windows completely on the Mac Pro.

Update. When reloading the gun, the headtracker begins working again, thjen stops once the reload is completed. Otherwise trackIR remains inoperative in the turret.

Happens consistently now. Server deletes all AI after a number of hours runtime. It's no longer worth running as it's not possible to complete the game. Have tried completely reinstalling all server files from scratch, no change.

There is a protractor available, but that cannot be rotated (unless I missed something) so you can't measure diagonal lines accurately, so there is value in this request. I sometimes use a real ruler held up to the screen as a workaround.

Occured today after 5 hours runtime.

Occured again on alternate server running conflict after 16 hours runtime.

Third time this happened, this time on Arland map hosted on a different server. After several days uptime, all enemy AI vanished.

I see this is fixed now, thanks!

This is a serious gameplay/strategy issue.

1. After an assault, you cannot tell if you have accounted for and eliminated all previously counted enemies.
2. You cannot loot bodies for weapons/ammo, which is unrealistic.
3. Vehicles cannot be parked for use later, affecting strategy.
4. Your own body disappears too quick, which is annoying for respawning.

I suspect it is done this way to save on server resources, but it should be possible to have this at least adjustable by the server owner, who can tune it for their own requirements.

I reported similar in T168693
Other tools are also not useable (watch/compass/match/torch/bandage)

Does deploy bipod do anything at all other than the cosmetic change? Seems you can raise or lower it but it makes no difference to functionality.

US Truck

Russian truck

Additional notes, possibly related, but the US truck suspension also does not move now either, the wheels do not bounce over rocks, only the whole vehicle, as if the springs were solid.

Video taken at night, repeatedly pressing the L key.

Only affects larger US trucks (supply, transport, radio). Jeep and M2 not affected, neither are Russian vehicles.

Noticed this as well. Truck front wheels do not steer left or right when turning.