>I run principal.scx just one time. The first form that i run is "login.scx" and then this one runs "principal.scx". I have some lines in the "activate" property of the form, referencing to "principal." and works fine, but once that the form is activated and i press any button of the form or anything i find that the reference to this object is lost, so i found the error "Object Principal is not found".

then set a breakpoint for:

* Break when an expression becomes true
VARTYPE(m.principal)#"O"