I cannot reply to your questions Jackie as I can't get in to my post, it does seem that I can start conversations though.
In answer to your questions though
I am on a laptop, always, I never use a phone to access the internet.
The options for 'log in' 'notifications' 'messages' etc are not blocked by ads, they are simply non-existent and the space where they should be is blank, occasionally when I get on to the page it has my details at the top where they should be but the minute I try to do anything on the page all of my details disappear and just leave the blank spot.
I cannot reply to posts as there is also no reply box at the bottom of posts that there usually would be when you are logged in.
It does appear that even though I have no log in option at this point that I must be logged in as I can post this and it is under my name.