r.line stops partway through

Following up my weekend message:

I have written a r.mapcalc to remove the "isolated cells".
Now r.line only reports the crowded cells (only a few), but it *still*
stops part-way down the image. When I tried it on a smaller region
of the image, it ran right through and reported

GRASS 4.1 > r.line input=k300thin1.1 output=k300line1.1
Opening files
Performing extraction
Closing files

quite happily. This seems to suggest that there is a built in limit to
the size of maps that r.line will process. Can anyone confirm this?

Simon Cox
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      __ L Dr Simon Cox
   ,~' L_|\ VIEPS Department of Earth Sciences,
,-' \ Monash University, Clayton Vic 3168
( \ Australia
\ ___ / Phone +61 3 565 5762
L,~' "\_x/ Fax +61 3 565 5062
           u simon@cerberus.earth.monash.edu.au
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