fop exception: some content could not fit into a line/page after 50 attemps

Hi

I'm trying out docbook xsl 1.70.1, and to go with it I
upgraded from fop 
0.20.5 to 0.92beta.

For the construct

<chapter>
   <title>
   <sidebar>
   <task>
     <title>
     ...

I get the fop error "some content could not fit into a
line/page after 
50 attemps".  The error occurs for the fo block output
corresponding to 
the task element.

For

<fo:block space-before.minimum="0.5em"
space-before.optimum="1em" 
space-before.maximum="2em"
space-after.minimum="0.5em" 
space-after.optimum="1em"
space-after.maximum="2em" 
keep-together.within-column="always"
id="p-cc-coicheck">

if I manually edit the fo output, changing the value of 
keep-together.within-column from always to auto, the error
stops.

My question:

Is there a way to do for task elements, what was recommened
for sidebars 
in http://www.oasis-open.org/archives/docbook-a
pps/200603/msg00182.html ?

Given there is no sidebar.properties attribute set, do I
need to 
customise formal.object.properties itself? I tried this, and
got some 
strange behaviour in tables breaking across pages (though I
don't know 
if this is due to customising formal.object.properties or is
a separate 
problem arising due to the change from fop 0.20.5 to 0.92).


Thanks in advance.

Graeme Perkins.

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