[NTG-context] \setupuserpagenumber not working as expected

[jbf]

Am seeking to have frontmatter pages in roman numerals and from Chapter 
1 onwards in arabic numerals. I have achieved something of the kind, but 
page 1 (arabic) is appearing on the last page of the frontmatter and not 
the first page of Chapter 1. I do not know why this is happening. My 
setup for page numbering is as follows (something I found somewhere - 
wiki? elsewhere? Not sure. I didn't make it up!):

\definestructureconversionset[frontpart:pagenumber][][romannumerals]
\definestructureconversionset[bodypart:pagenumber] [][numbers]
\startsectionblockenvironment[frontpart]
\setupuserpagenumber[numberconversion=romannumerals]
\setuplist[chapter][pageconversionset=pagenumber]
\setuppagenumber[number=1]
\stopsectionblockenvironment

\startsectionblockenvironment[bodypart]
\setuppagenumber[number=1]
\stopsectionblockenvironment

The frontmatter is some 16 pages worth (ends on a verso page but that 
verso carries the arabic number 1 instead of page xvi which it should 
be, since the final paragraph on that page ends with \stopfrontmatter. 
That means Chapter 1 (immediately after \startbodymatter) is now page 2 
instead of page 1!

I tried a slightly simpler version of the above which I found on 
Stackexchange:

|\definestructureconversionset[frontpart:pagenumber][][romannumerals]||
|

|\startsectionblockenvironment[bodypart]|

|\setcounter[userpage][1]\stopsectionblockenvironment|

but it gave me the same result. Any idea how I can get the correct result?

Julian

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