Eddy, Thanks for going to the trouble of testing that and posting your findings, much appreciated. Having read your post and also the most recent posts on Warp9's forum i'm confident the old issues have now been fixed.

As a matter of interest, could you post which version of Mach and the ESS plugin you are using. I believe 'ES_v10o1d1h' is the most recent ESS plugin.

Si.