Scot thanks for getting back to me , here is the full trace, on looking at 
it is says that the graph is read only, but two things in my mind conflict 
this. 

1) When adding a triple from comoser , the triple actually appears in the 
repository
2) I can quite freely update the repository using java


the trouble comes when trying to save

The version of TBC is Version: 3.6.2.v20120921-1501R;
The version of Sesame is 2.6.8

I hope you could shed some light on this 

Regards

John
On Sunday, 30 September 2012 13:51:56 UTC+1, John Perdoni wrote:
>
> Hi I wonder if you could help
>
> I have just come back to do some work on with my s2r files but something 
> has changed and I am now getting the following error when I try saving any 
> changes to s2r files (although the triple is created in the sesame 
> repository)
>
> Save All Failed
> org.topbraid.core.graph.concurrent.ThreadSafeGraph cannot be cast to 
> org.topbraid.sesame2.graph.RepositoryGraph
>
> This even happens if i start with a new repository
>
> ie create a sesame owlim-lite repository using sesame open-rdf 
> workbench,and export a file from tbc to this repository, if i add a new 
> triple via tbc and save i still get the error
>
>
> Hope you can shed some lite on this
>
> Regards
>
> John
>

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