Reliability of the CST software

Hello, everyone, have you ever met this before:
1.when changing parameters , some components of the original structure totally disappeared after i clicked "OK"
2.after deleting some operations in history list, the same occured
I doubt it was due to the incompletely ***** of the software.
What's your advice? Thank you^^

Mmh..
I only had this problem in the past if my used parameters values did not make sense. For example generating a parametric cone (hight is parameter) and then picking the top face. If the hight is to large, the top face will vanish and the picking will fail...
My mistake...
Maybe simply post your structure here (*.mod and *.par file) and we have a look..
F.

Many thx!
But maybe what you met was another story.
My problem is: when i deleted a few operations that i did previously,it seemd that the whole structure totally "collapsed". Since the structure was already ruined, i'm not sure whether the correct structure could be displayed in your CST.
It's rather kind that you could help me through:
xiongjiang@coer.zju.edu.cn

Hi,
I could open your model without trouble. However, simply deleting steps in the "history" list is not a good idea if you used the picking functions. If you delete something and later the history tries to pick some faces or point on this elements, the picking ca not work...
If you would like to delete something you can do it just by selecting this object and deleting it..
Which parameter would you like to change?
F.

Thank you for your study on my model!
i got what you mean now, and perhaps your analysis about the history list did explain the curious problem. It's a piece of good advice.
BTW, how many components you could see in the model?Did you see the complete substrate, patches, vias..., and port?
I posted this subject just to make sure my CST is validate and the result is believable. Thank you!

Thanks to RFSimulator for your advice and i've got the rough result now.
Your analysis on "history list" may really hit the point!