Just to join the dots - I had a remote desktop session with one of the PV engineers a couple of days ago which helped to localise the problem area (appears to be some kind of discontinuity between the 3D graphics in myCNC and the graphics card OpenGL driver). The engineer has contacted me again today and we should be having another test session early next week so that he can run a debug version of the software to better analyse exactly where the problem lies. He did leave me with a workaround which is allowing me to run myCNC on my "problem" workshop PC although with some minor restrictions (which do not interfere with my normal operation). At least I can continue working on playing with some macros for the time being (my set of tool-height setting macros, sorting the M6 tool change macro to suit my way of working, MPG programming, etc).

There are a couple of other more minor Windows-related issues to do with screen sizing and startup position - as it stands, the initial configuration comes up with the myCNC window somewhat displaced to the right. That's OK - there are startup options to fix that. Unfortunately, on a smaller monitor, the "save configuration" button is off the edge... I'm told that a fix is coming out shortly! I fixed this one by doing the initial configuration on a two-screen PC, then copying the profile to my target machine. It's also possible to edit the relevant .xml file, except that until you have done it, it's not obvious which parameter needs to be changed. If anyone wants more info, give me a shout but at the moment I suspect that Dean and I are the only forum members (outside Ivan and friends) with an ET* series card.