Using BT Yahoo Webmail. Compose a new message. Start typing a To: Address and autofill does NOT offer me options ALSO Backspace does not work.
Tried on 2 PCs (Win 8.1 and 10). Three Browsers Chrome, Firefox and Edge. Chat told me to clear Browser History, that had no effect.
NOTE. My wife's account on same PC works. Note. works fine for my account in "Classic" Webmail.
Clearly something with my account.
No, I have also same issue