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[Calessa Lynn Orphiel]

I had a surface tower constructed entirely of wood -- the structure was 6 floors tall, with a dimension of 7x7, a staircase on each corner and an off-center staircase toward the south-center.  I decided I would extend the tower so that it continued in a subterranean fashion, and decided to shift the off-center staircase to the central tile.

I started with a miner digging a staircase straight down, with a down staircase at surface level, and then up/down stairs all the way down to the lowest z-level of my map where I terminated with an up staircase.  While my miner was doing this, I ordered one of my carpenters to build an up staircase on the same tile the down staircase occupied.  The dwarves were happily using the up stairs to reach the second floor of the tower after I added the corresponding staircase upstairs.  

I went off to manage some other issues, when I got a notice that my miner had died of thirst.

Long story short:  It appears my miner was trapped underground because the up staircase constructed by my carpenter prevented my miner from using the up staircase to leave.

I figure this is some sort of bug related to having an up staircase and a down staircase on the same tile, as opposed to a up/down staircase.  I know that normally one cannot build one staircase of each type on the same tile, but in this case, one was mined out, and the other constructed.

An interesting side note -- I removed the constructed staircase and the mined out down-staircase was still there, and was then usable again.

[Avelon]

It's not a bug - anything constructed in a tile where something else has been designated will cover the designation: In this case, the down-stair.

[Calessa Lynn Orphiel]

Ah, I suppose that makes sense.  Though it still doesn't, from the standpoint that two staircases both can and cannot function in the same place at the same time simply because on the material and time of construction.  

[Exponent]

This sort of thing has confused me too.  For example, if you have an up/down staircase one level below the surface, and an unmined ground tile above it (rather than a down staircase), you can then build an up/down staircase on the ground level through the ground, and it will work.  I don't remember if I tried or not, but I get the impression that if you were to then deconstruct the up/down staircase that was built on the ground level, the ground tile would still be there.  Apparently, up/down staircases make a portal through ground.  And it is probably what you needed to build to get the result you wanted.

[Calessa Lynn Orphiel]

I started digging out of habit as if I was just building a stair down -- That is, starting with a down staircase.  Forgot that I was planning to go up as well.  When I saw that I could place the up staircase as a construction, I did so without a second thought.

It's been an interesting fort -- I went the first 3 years without chopping a single tree or mining a single square.  I wanted to see how well I could do, but I got fed up trying to manage so many dwarves, so when an immigrant wave had both a miner and woodcutter, I went ahead and started chopping and mining.  The miner died on her first project.  

About 2 months later, a goblin ambush popped up with 6 marksman.  With basically nothing standing between the goblins and my dwarves, I lost about 1/3 of the fort.  Melancholy, Berserk, and Insanity have claimed about half of my legendary dwarves now as well.