I had this problem about a month ago and I’m still having it now. When editing URLs for an extractor (i.e. editing text in the middle of a URL), rather than simply entering the typed characters, the characters are instead typing over the existing ones. This isn’t to do with the Insert key on the keyboard (which I know can be used to overtype) - I have tried pressing this key in case overtyping was turned “on”, but it didn’t make any difference.
I’m using Google Chrome. I’ve just checked in Internet Explorer (which I know isn’t a recommended browser to use) and the same thing happens there.