Creo 3 + EMX 9 bug or something

Hi there,
I am quite new to EMX so excuse me if im not so enlightening.
Creating a new project on EMX 9, when i'm trying to change the default size i
always get the same error: "Part not changed since the last regen"
Searching the model tree i found that in the skeleton prt (shown in the image i uploaded) , scetch2 dimensions fail to regenerate.
Am i doing something wrong, is it a bug, something missing from the program?
Thanks in advance.
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