In file CategoryProduct.ascx located /NopCommerceStore/Administration/Modules/, there maybe an encoding issue.
In line 69 to 74, some codes looks like follows:
<asp:NextPreviousPagerField ButtonCssClass="command" FirstPageText="? PreviousPageText="?
<asp:NextPreviousPagerField ButtonCssClass="command" LastPageText="? NextPageText="?
Is that an encoding issue or others?
The same codes come out in both 1.6 and 1.7. In version 1.6 the .Net Framework 3.5 didn't break the programes, but version 1.7 runs .Net Framework 4.0, there is an Parser Error occurred during adding a category. So I modify there codes to this:
<asp:NextPreviousPagerField ButtonCssClass="command" FirstPageText="FisrtPage" PreviousPageText="Prev"
<asp:NextPreviousPagerField ButtonCssClass="command" LastPageText="LastPage" NextPageText="Nest"
Then the programe is OK.