What error are they seeing? Are you sure it's windows specific?

Yes, it was windows specific. I've done some testing with a few of them and they were able to register after enabling catch_workers_output in www.conf for php-fpm. Restarted and it's ok now. Not sure if it was enabling that fixed it or if a restart was all it was.

Ok, but what about web browser? Are they using IE or Chrome?

People still use IE?

Personally I hate IE. Fortunately they were using Chrome or Firefox.

Some people are clueless that entering their password again would need to match the first one. I should probably develop a checker unless a plugin has already been made for that.

I use IE and have never had a problem on any site, ever.  Your 'people' are doing something wrong.

And it's not Windows either because that would mean 85% of all users would be having a problem.

That's a pretty bad usability problem that I'd lay at the feet of the people who wrote the login form (ahem... me...).

Core patches appreciated but yes, a plugin to improve that experience is the next best thing...

@Evan it's pretty straightforward, I added this to the second password input "Password (enter again, must match first password)" and hopefully it'll be clearer for them.

@Cim

That was the error? But that seems to be pretty straightforward.