Hi,

³As of Taverna 2.3.0, GraphViz is no longer bundled with Taverna for MAC OS
X due to an issue with 32 and 64-bit versions of GraphViz...² [1]
For me (and for many others out there reg. Google) the installation of
GraphViz v2.28.0 could not be completed on Mac OS X Leopad (10.5.8 in my
case) due to the following error:
----
Install Failed
The following install step failed: run postupgrade script for local.
Contact the software manufacturer for assistance.
----
Again for me it was possible to install an earlier stable version (v2.26.3)
of GraphViz [2].
Now I can successfully create/edit workflows with Taverna 2.3.
Just saying for those who might have the same issue!

Best wishes
Mustafa

[1] http://www.taverna.org.uk/download/workbench/system-requirements/
[2] http://www.graphviz.org/pub/graphviz/stable/macos/leopard/



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