strcpy_s vs strcpy

Hi,

 I have changed my strcpy to strcpy_s for 2005 project.  It's fairly
big project and was using strycpy lot of places.
The program started corrupting the stack and in turn cra****ng the
application.  We have realized that it is due to strcpy_s.  We have
changes that to strpcy and then it was fine.
There are some places the destlength was more then whatever size of
deststr.  I know it is a mistake but the copy string had character to
copy.  So I was thinking it shouldn't crash the project. Isn't that
true?

Example:
deststr[128];
copystr[] = "Test String";
destlength = 256;

strcpy_s(deststr, destlength, copystr);
even strcpy_s(deststr, strlen(copystr), copystr); was cra****ng (I need
to look more for this)

But is there any known problem with strcpy_s?
Thanks
Trupti

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