Web Lookup issue regarding Umlauts being depicted as long character strings within the word being sought after

Hi everyone, my Web Lookup app usually works great, but today it suddenly starting putting in lots of characters when I was looking up words via Linguee - all the German Umlauts are converted into character strings which means the words cannot be found, e.g. : k%C3%B6nnen gef%C3%A4hrliche - this should just be können gefährliche. I tried upgrading the Internet Explorer version to 11, but all that did was give me massive advertising areas on both sides of the Linguee page. Went back to default (7), but the problem persists. I am using 2015, Windows 10. Never been a problem until today :( Any solution??