Thanks to all who replied, sorry to take so long for the summary, but I
wanted to check for sure that the fix worked. Anyway, there are 2
approaches:
(1)  load the jumbo patch 101318-54 that has mutex stuff amoungst 
     many other things. We had an earlier version (-30) of this patch
     loaded, & it hadn't fixed it. We didn't try this, as the next 
     one worked.
(2)  What worked for us (don't ask me why!) :
         
         add the following line in "/etc/system" :
                        set enable_sm_wa = 1
Roll on Solaris 2.4 !!!!!
Many thanks to:
        ebernard@ifremer.fr     (Eric Bernard)
        brossard@siisun.epfl.ch (Alain Brossard)
        gdmr@dcs.ed.ac.uk       (George D M Ross)
cheerio,
Brett
-----------------------------------------------------------------------------
Brett Newton-Palmer,                **            e-mail: brett@erm.erm.oz.au
Technical Support Manager,          **            Phone: +61 9 388 2900 
Earth Resource Mapping Ltd.         **            Fax:   +61 9 388 2901
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