Creating hatch doesn't seem to work

I am new to nanocad (installed the SW yestarday) I have used the free version so far, but I am now trying the commercial one. Latest realease on Windows 10.

I am trying to create a hatch for a closed object in a file which I initially opened with the free version of nanocad, but even though I try different combinations of scale nothing happens when I hit the Ok button. This drawing was probably made using Autocad, but I am not 100% sure.

However if I open a brand new file and draw shape and then insert a hatch it seems to work
Help appreciated
Regards

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