Mumsnet won't accept my username

Yep, same here. It will allow you to post once, then when you try and post again in the same thread it's throws up the ' enter username ' box, but you can't type anything in this box. Interestingly, it allowed me to post twice though on the other thread about these problems...

Me too! Using the same name I e always used plus it won’t allow me to change names

I just tried to post on another thread and it threw up an error message saying I had to confirm my user name- which was the one displayed.
I did manage to post in the end though.
It’s just done it again on this post.

This has happened to quite a few people @justasking111 I have seen threads on here about it (Site Stuff.)

I have had it happen to me several times, but it corrects itself when I restart my computer. Don't know why this is happening. It asks you to enter a username (when you are trying to post more posts on a thread after already posting one right?)

... So you post one post on a thread as your username @justasking111 , and even though that is the default name for that thread now, it keeps asking for another name? If this is what you mean, as I say, this has happened to a few people. Any idea what's going on @MNHQ ??

.

You can change your username, but you can only have one username per thread. So if you post on a thread where you used an old username, you can't use your new username. Is that what you're referring to?