Hi,
the results of the inner and flushinner (and also outer and flushouter) keywords for \setupalign are reversed compared to MkII. I guess this happened when the code was rewritten.
Attached are results from the following example in MkII and MkIV.
\setuppapersize[A5][A5]
\starttext
\startbuffer \startalignment[left] \input ward \stopalignment \stopbuffer
\typebuffer \getbuffer \page
\startbuffer \startalignment[flushleft] \input ward \stopalignment \stopbuffer
\typebuffer \getbuffer \page
\startbuffer \startalignment[inner] \input ward \stopalignment \stopbuffer
\typebuffer \getbuffer \page
\startbuffer \startalignment[flushinner] \input ward \stopalignment \stopbuffer
\typebuffer \getbuffer \page
\stoptext
Wolfgang