> The same as in my first reply. Look at the first page with the text
> only. There isn't a space behind the sentence(s) and TeX can't break the
> paragraph (text expands it's lower border). This also breaks the
> splitting of the table, as it is (partly) on the same page.

Peter, all of the information that you've sent me has been very educational, but I think you may be focusing too much on the approach that I've used to illustrate the errant table splitting behavior.  The example below also illustrates this behavior and does not extend the text below its lower border as did the previous example. 

This is of course a contrived example -- I unfortunately cannot post a real example.  You can slightly change the layout and the problem will going away (for this particular document).  The problem is that my ConTeXt rendering layer has to process arbitrary XML input and this very same behavior pops up in documents regardless of the layout.  Making adjustments to the layout, font size, etc will just change where the problem manifests itself.  It is still possible that I'm doing something wrong, but my gut tells me that it is a bug in the context natural table splitting code.

\setuppapersize[letter][letter]

\setuplayout[textwidth=6.5in,
             width=middle,
             height=middle,
             footer=3\bodyfontsize,
             footerdistance=\bodyfontsize,
             header=0pt,
             headerdistance=0pt,
             top=\bodyfontsize,
             topdistance=\bodyfontsize,
             topspace=0.8in,
             bottom=\bodyfontsize,
             bottomdistance=0.5\bodyfontsize,
             bottomspace=0.8in,
             location=middle]

\showframe

\usetypescript[times][ec]
\setupbodyfont[times,13pt]

\setupwhitespace[big]

\starttext

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

Now is the time for all good men to come to the aid of their country.

\placetable[split]{Broken Split Table}{%
\bTABLE[split=repeat]
\bTABLEhead
\bTR 
\bTH Header A \eTH
\bTH Header B \eTH
\eTR
\eTABLEhead
\bTABLEbody
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\bTR
\bTC A \eTC
\bTC B \eTC
\eTR
\eTABLEbody
\eTABLE
}

\stoptext