I just tried cutting a design using Build 451 for the first time and had major issues with the results on my machine. Everything looked OK in the preview simulation (although the operation times looked unusually long), but when I ran the job on my machine, on the first pass it plunged the bit past the original depth I had specified, cut the pocket, and then kept retracing its path for another 10 times or so - it’s hard to tell if it’s changing depth on these passes as I have a dust boot installed. It also completely ignored the tabs so it destroyed the piece it was cutting when it broke loose.
I tried uninstalling it and installing an earlier version (431), but even after uninstalling and manually removing the Carbide folders I’m getting some strange “NaN” information where the feeds and speeds info should be.
I wanted to post and see if anyone else has had problems with Build 451. I just created the same program on build 433 (different PC) and it works just fine.