This is not a bug but a feature.
When you extrude an object, now there’s an opportunity to use:
You just have to tap the value label and use numpad to enable it.
You see the red ghost because you are doing a subtraction. If you only want to do that, than yes, there’s an extra step in this version. But if you want to do intersect or a new item, than this new function makes it way easier to do these. For an intersect previously you had to create 2 items, select tools / subtract / select objects in the right order, click ok, delete and so on. Now it is available in 3 taps.
You can read more about this feature here: http://blog.shapr3d.com/whats-new-in-shapr3d-jan-2017/#New-extrude-commands