I have recently upgraded to V26 and I think there is a bug in the threading parameters menu.

If you change the thread height from the default and compute everything is good.

If you go back to edit the parameters the thread height has reverted back to the default, this ruined my thread as I had not seen this when I re computed the tool path.

Please could someone have a look on their system to check if the problem can be repeated.

The parameters I used were (metric) 2.5 pitch, 1.2 thread height, 0.1 first cut amount, 0.05 last cut amount, 0 deg thread in-feed angle.

Thanks Bill.