|re: "I have a problem when copying cells with formula from window to a new window"|
It's not a problem, it's a feature. ;-)
I know that you are not specifically trying to use "Paste Special" but the issue described here applies to copying formulas since a formula is (more or less) an "attribute" (sort of) ;-)
In any case, call it what you want, you can't do it.
There is a macro in this thread that supposedly lets you copy formulas between instances, but I've never tried it:
Click Here Before Posting Data or VBA Code ---> How To Post Data or Code.