There are essentially two meanings of "steht" :

The first one means that something is stopped
(es läuft nicht, sondern steht),
doesn't walk (it hangs) (as in 1.,2.,4.)

The second one means that something has everything to stand upright, like in 3.:
here it could mean that the programming of application XYZ is finished. (depending on the context)
If 3. is an error message, then it should also be interpreted as meaning one.

So you are totally right with your first guess "to hang".

thts quick and precise..thanks!