photoshop freezes

Hi! This isnt really an icon question, so I hope its allowed, but I have a problem. For some reason, the other night, my Photoshop has been freezing anytime I try to go to the "stroke" effect. Or any other effect in that menu. It has always worked before but now it freezes everytime I try. Ive ran virus scans and other check ups and nothing has fixed the problem. Anyone know what I can do? Thanks.