Yes, it's a known bug, it may happen in singleplayer as well as in multiplayer. It may happen more frequently on multiplayer servers, when multiple players are digging at the same time.
Only workaround: Press F2 when falling through ground, this enables you to return to the surface safely.
We're working on a solution 
Genau, ein offizielles Wiki ist bereits in Arbeit und wird hoffentlich demnächst verfügbar sein
Freut mich zu hören, dass es jetzt funktioniert!
As @Quezax said, we're currently preparing a wiki which contains a full overview of all functions and events 
The area protection was indeed just a small basic example.
We will give the wiki a higher priority now. Before Steam release, there were not many people playing multiplayer, and even less people using LUA scripts, so we concentrated on other things. But this has changed now with steam. As soon as the serverlist is running (probably with the next update), we start working on the wiki (to get at least the LUA section online).
Sorry for the late response! 
The old version of the dedicated server from Thuesday had a bug. Please download the newest version
Seit aktuellstem Update sollte die Standalone wieder funktionieren. Falls nicht, bitte alle Dateien im Spielverzeichnis (außer Worlds Ordner, config.properties und risingworld.exe) löschen und erneut starten.
There is no real limit concerning max players currently, but we haven't tested yet how many players a server can handle. It mainly depends on the performance of the server.
still want mac fixed though
friends cant playyy
Did you talk with @lucien.schuenke about this issue?
Es kann sein, dass du die neue Leiter blockiert hast? Wenn man selber einem Objekt im Weg steht, kann man es nicht platzieren. Du kannst Leitern aber auch modular zusammenfügen, einfach mit der neuen Leiter das obere oder untere Ende der bestehenden Leiter anvisieren Dasselbe funktioniert auch für Küchenzeilen.
1. That was already suggested previously, unfortunately, we haven't implemented that yet. But it is in the works
2. Armor is coming as soon as we have reworked our playermodel (then we will also introduce different clothing etc.)
3. Iron is not in the game yet, that's the reason you can craft it for free at the anvil. Once it's implemented, it has to be mined and smelted
4. It's planned. The rake is intended to smooth out the terrain, we don't have a tool yet that is really intended to level the ground. But for farming stuff, we're planning to implement a hoe
5. Hopefully it won't take too long until we have water implemented. Once water is in the game, we will take care of fishing, boats etc.
6. It's our intention to implement that
7. Yes, food is planned and hopefully coming soon
We will post them in english soon. Here is an old overview (in german unfortunately), hopefully it's ok for the beginning: Link
But please note: Using a wrong item command may break your world (since you get an invalid item in your inventory)! It can be fixed by editing the sqlite file, but may still be annoying. That's the reason we don't post the game-breaking commands on the Steam forum
Wie meinst du das? Du möchtest mithilfe der Pfeiltasten die Blöcke bewegen während des Platzierens?
Is an old instance of the server still running in background (perhaps it was not terminated properly)? Have a look at the task manager, watch out for an "risingworld", "java" or "javaw" process (on windows). Tried the dedicated server myself just a few minutes ago, everything was working fine.
Perhaps there is still a bug when changing the default port 
I will have a look at it, thanks for the information!
Now a few days have passed since the game was released on Steam! Also we had been very busy dealing with the huge amount of new players and providing support for the game.
We are also sorry that the update we released together with the Steam launch was not available for the standalone yet. We are more concerned about the fact, that the old launcher was no longer able to connect to our HIVE, resulting in not being able to play the game anymore. This should be fixed now, we're really sorry for the downtime of the standalone!
ONLY FOR NON-STEAM VERSION: Now the game should be running again! If you still can't login, please delete everything in your game folder with the exception of the "Worlds" subfolder, the "config.properties" file and the "risingworld.exe".
Here is the full changelog of the latest update:
___________________________________________
Changelog 2014-12-03
-[New] Animals: Pig, Cow, Goat (more will follow)
-[New] Added 5 new types of flowers
-[New] New craftingstation: Loom
-[New] New objects: Two different thrones (wooden and stone throne)
-[New] New weapon: Morningstar
-[New] German language supported (unfortunately not working for standalone yet)
-[New] Added new variation for piano (black wood)
-[Change] Improved player, chopped tree and item sync in multiplayer
-[Change] Changed orientation of wood textures, now they are all vertically oriented
-[Change] Changed recipes, now you craft all kind of furniture and decoration at the sawmill, while crafting all kind of tools and equipment at the workbench
-[Change] Removed unused entries in context menu when right-clicking on another player
-[Change] Version is displayed in the main menu now
-[Bugfix] Chunk generation now works framerate-independet, resulting in faster worldgeneration on most machines (especially when travelling)
-[Bugfix] Fixed one of the "falling-through-ground"-bugs when all blocks within a chunks were destroyed
-[Bugfix] Fixed chests not saving their content when quitting the game too quickly after a chest has been modified
-[Bugfix] Fixed a bug related to player sync in multiplayer, causing other players appearing to lag
-[Bugfix] Fixed a bug causing the server to save playerdata twice at the same time, which was not necessary
-[Bugfix] Fixed a bug causing chunks not to load in some cases
-[Bugfix] Fixed blocks removing too much grass when being placed
___________________________________________
Changelog Bugfix 2014-12-06
-[Change] When creating a new account ingame (Steam only), you can now use tab correctly
-[Change] Updated sleeping behaviour of animals
-[Change] Changed Console key from F12 to ^ (or ` depending on keyboard layout, should be the grave key [the one next to "1"]).
-[Bugfix] Fixed threadpoolsize (some machines seemed to run the game singlethreaded, resulting in horrible performance)
-[Bugfix] Added a workaround when starting the game and being unable to connect to the HIVE (Steam only)
-[Bugfix] Fixed size of thrones (they were far too big, but it was quite a funny issue^^)
Yes, that's a good idea I think, we will add it tomorrow
Yes it's not your fault, I'm currently preparing the changelog 
Oh great!! Glad to hear that! 
Unfortunately it's getting too late here, so no time for me to play unfortunately 
But I'm pleased that your game works now!
Let us (we're 3 ppl on the project^^) know if any other problems occur
Animals don't drop loot currently by the way, this will come with a later update
The key was changed in a small bugfix this evening. Try the grave key (^ or `, depending on your keyboard layout, the key next to "1").
