DateTime.Now not showed in form

hi.

I have a problem in my datetime attributes.

I have a datetime att. in the first activity that I created an on enter expression for it with code of "DateTime.Now". I reinstall my windows recently and I see forms that already was working but now the datetimes seems null. the date and time record in database but I can not see it in the form. its wonderfull

I test it in other computer with same bizagi version. worked successfull!! but in my computer...unfortunetly

what can I do to solving that

thank you

best regards