We are currently evaluating software and recently had an on-site demo of Mastercam. We were told that reverse-posting of G-code is no longer supported in X3. If this is the case, how do you work around this issue ?

I am figuring you want to reveres to see what old programs are doing. I use the predator editor for basic back plot of programs from customers or Full version of Cimco.
Some dealers would be able to make a reverse post but you are better off getting the editor. So which dealer in Cali Cad-cam consulting or San Diego Cadcam or Serria cadcam.

I am figuring you want to reveres to see what old programs are doing.

Thanks for your response. Yes we would like the option of running existing toolpath over the model, selectively re-working features etc. I always thought rev-posting was a standard feature in previous versions of Mastercam
Thanks