Until today I could begin typing a member name to tag them, like @ohmomof2 and after the first letter or two suggestions popped up (saving me from having to remember how to type a username that has spaces in it, or one like “SomeWord745236”).
Today the auto-complete suggestions are not appearing. I just tried Firefox (I use Chrome normally) and no dice there either.
^ As you can see if I do type the entire username, the tag appears after I post it. I am referring only to the disappearance of the auto-complete feature (and perhaps related, no highlight until the post is published).