Thanks very much for the reply, I have tried this with a clean R and bioconductor installation and get a similar error.

ArrayQualityMetrics works ok, it just fails to produce some of the graphical output.

 Cairo version:
pkg-config --modversion cairo
1.2.4

When I tried updating Cairo on the Redhat linux machine I am using as suggested by your link there were no updates to load.

Is there anything else that you could suggest I could try.

Thanks again for your help

Ros




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