UNO:can't enter any code in win7 arduino programmer

Examples uploads well, like blink, but i cant change or write new codes, the ide software became gray and doesn’t respond.
Window7 and drivers run ok.

In File > Preferences, is use external editor checked?

groundfungus:
In File > Preferences, is use external editor checked?

Yes
Thank you
I jest unchecked that and it works.