Earlier, I tried to place a ladder on the edge of the world. This caused the workers to stop moving, but the camera could still be moved.
Expected result: not being allowed to place the ladder there
Actual result: workers freeze and game crashes
There were no error messages.
i know this may sound silly, but can you post a screenshot of what you were trying to do? i’m having a hard time visualizing…
Like this:
There’s a piece of ladder in the centre of the screen, which I just placed by clicking on the edge of the world.
oh… awesome! weird… but awesome! 
so you had nothing selected (you just clicked on the edge), or you had the ladder tool selected first? either way, afterwards the game completely froze?
edit: sorry, just reread, and it sounds like you had the tool selected fist (which makes more sense)… just wanted to clarify…
Will there be a time when we won’t see the edge of the world?
Because in that case, we won’t be able to place ladders there. Anyway, this behaviour was a bit predictable, wasn’t it? 
Except for the lack of error message, but that’s not that strange, it’s terrain after all.
yes, eventually… looks askance at @Albert
just out of curiosity, why were you attempting this?
To see what happens when you do it (I don’t know what I thought would happen)
Well @sir_ghost, I for one praise your intrepid exploration of ladders!
Ladders don’t appear to be build-able top > down so starting slightly up an incline would result in some problems getting down on to the flats from what I’ve experienced. Villagers just ignored the placement.
I found a slightly similar bug in Alpha 10 the other day. I don’t think it’s different enough to deserve a new topic.
Steps to reproduce
Expected result
Dragging out a slab over the edge is not allowed
Actual result
It is allowed, but as soon as you let go of the mouse, the game freezes* (without an error popup)
*everything stops moving, but the camera can still be panned around
