Worklfow stops at background task in a single client

[Sunni sunni]

Hi all,
 
I have a very strange problem.
I am working in a multi client environment.  Workflow changes made in master
development client 100 are picked up in client 200.  The strange thing is
that in client 100 my workflow suddenly stops on a task which calls a
background method, and hangs there.  The workflow log states, background
method started, but never completes.
 
In client 200 the same workflow is fine.  The strange thing is that the
development isnot client specific so it should work in both clients the
same.
 
I have tried running SWU_OBUF, I've tried re-activating the workflow, I've
tried reactivating the object being called in the hanging task, I've tested
the object method in SWO1 & its fine in both clients; .....
 
So I'm all out of ideas, can anyone suggest what may be causing this??
 
Many thanks
Sunni
 
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