As you may notice, this forum underwent an upgrade today.
In the past, the sign-in process required you to enter your registered name (not your forum display name) and password.
This has now changed, and you now must log-in with your forum display name and password. This rendered my browsers saved log-in information inoperative. Easy enough to correct once you understand that.
I decided to place this post when I checked how many people were viewing the forum, and saw 11 guests and 0 logged in users. So I suspect the new log-in may have caught more than a few people unaware. Since guests can see this post, hope this helps