Hi,
I'm having the same problem.
With RepG 0017, it can't find Python and there's no way of pointing it in the right direction. The control panel works fine, can heat up and extrude and move x,y and z.
With RepG 018, it can't find Python but is happy once I point out the directory. It completes the toolpath immediately, the temperature is always -1 degrees and the simulate function shows a blank page. The build function completes in 10 seconds and does nothing else. Again the control panel functions perfectly.
I've tried running them both under XP compatibility mode, which had the same results as above.
Any hints or suggestions would be grateful received.
Thanks
Andrew