Adobe form not working Editable

Hi Experts,

I have adobe interactive ( editable form Including dropdown/ Text box/ Check box) form, which will send to user to fill the data & submit by to return email id. the form is editable but today onwards i couldnt able to change the values in form (not editable). Any idea.

ABAP, SFP transaction.

Adobe reader - 9.4

Pl help

Regards

Kishore