This happened again to me the other day in DF;

Some Nightshade (cant remember the name) killed some poor lowbie soloer, so me and a sham friend went to res him. Up to this point we had 0 issues with mobs disappearing and haven't had for months. Yet as soon as we ressed this guy, he disappeared from the ground to show he had accepted the res, but never appeared.

We thought this was odd and carried on, only for the shaman to get suddenly hit 3 times and killed by something invisible; turned out to be that NS. I hit target nearest enemy, and stick and was able to swing and hit a couple of times, but i never saw the NS.

About 30 seconds later as i was lying in a puddle of my own entrails, that guy we ressed got killed again; so he was actually there, just invisible as well.

We released and went on to do something else, and had no further issues with mobs, or players disappearing.

A typical scenario is:
Log in, everything there. Open stable master merchant, buy a ticket, start selling loot. While selling loot everyone and everything except for some horses without riders disappear. I relog. Quick hand over the horse ticket, ride to the "empty" next horse master. Relog again, quick buy ticket and get on horse. Then I was participating an ally event for the reminder of the evening including a port into Dodens, Summoners Hall and back to Jordheim. Everything, except for frozen loading screens, suddenly working fine. It seems like "relog as long as it takes to work". @_o

Today I logged in at Gna... ~15sec after a flawless login (smooth loading screen) everything disappears. The last thing I was able to do, was to help a grey player to not get killed by a wolf. Sometimes some people appear which I would assume just recently logged in as well. Therefore I started a trial.
Second login: frozen loading screen, but everything seems fine so far (only watched for 60 seconds).

Usually this issue is caused if your client cannot correctly receive UDP packets from the game server. As a first step, try enabling UDP traffic to remote port 10400 in your firewall and router. Having a correct UDP setup is preferable, since it decreases your lag, and allows you to have a smoother RvR experience when a lot of players are around.

If you cannot get UDP to work and you keep seeing this issue, you can go to the Launcher preferences by clicking on "Edit" > "Preferences". In the preferences dialog, you will notice a white textbox labelled Other. If you enter +noUdpForMe in this box, we will never try sending you UDP packets. Note that this might increase lag and make your RvR experience slightly worse.

From our FAQ: https://www2.uthgard.net/howto#5

In case you haven't tried this yet.

Sadly I am already using +noUdpForMe, because the NAT of my 6to4 network tunneling of my ISP forces me to. This worked fine for around 4 months and started making issues again this weekend.

De_Kus wrote:Sadly I am already using +noUdpForMe, because the NAT of my 6to4 network tunneling of my ISP forces me to. This worked fine for around 4 months and started making issues again this weekend.

I would like to check that when you are logged in. Please callgm in the evening (EU times) when it happens to you so we can check where the problem is.

Yesterday was fine for me, today I am having frozen loading screens, but visibility of mobs and players is flawless. I'll /callgm when I am having those issues again.

Little update:
Haven't had this issue again myself, yet.

Though I often hear people relogging, because of that issue. I haven't been able to confirm a case in which relogging alone didn't help or the noUDP parameter was already set.

i'm having exactly the same issue from my station. I've been playing for months without issues, now NPC/MOB/Players are disappearing.
Any help? noUDP and others already tried out.

Shalee wrote:i'm having exactly the same issue from my station. I've been playing for months without issues, now NPC/MOB/Players are disappearing.
Any help? noUDP and others already tried out.

i have the same trouble again since the last reboot. Maybe Blue changed something ? Its really weird, that there was so many time now without any problems, and exactly with my first login after the reboot it start again..