arranging + multipage \bTABLE + transparent color = bug?

[Johan Sandblom <Johan.Sandblom@cns.ki.se>]

The following code compiles flawlessly but the pdf that is generated opens 
with the error "Could not find the Extended Graphics State named 'Tr1'."
in Acrobat Reader 7 for Linux (and Windows for that matter). Earlier readers
give less informative messages but in all cases the pdf has almost entirely 
empty pages. If the second line is uncommented (so there is no arranging) 
there is no problem. If the color is non-transparent, there is no problem.
If the table needs less than 4 sheets to be arranged on, there is no problem.

Is this known, expected, fixable?

Johan

\setuppapersize     [A6][A4] \setuparranging     [2*4, doublesided]
%\setuppapersize     [A6][A6]
\setupcolors        [state=start]
\definecolor[tgray][s=.8, t=.5, a=1]
\starttext
\bTABLE[split=repeat, frame=off, background=color, backgroundcolor=tgray]
\dorecurse{200}{\bTR\bTD 1\eTD\bTD 2\eTD\eTR}
\eTABLE
\stoptext

-- 
Johan Sandblom  N8, MRC, Karolinska sjh  
t +46851776108  17176 Stockholm  
m +46735521477  Sweden           
"What is wanted is not the will to believe, but the 
will to find out, which is the exact opposite" 
-- Bertrand Russell