Smartys wrote:Unless someone else can replicate it, I can only assume it's an issue with their settings for cookies
Could it be going to www versus non-www?
Just double checked on that. She's been using the correct address. Got some screenshots that show everything fine in that regard. Correct URI, in all shots.
One other thing I will mention. When she attempted registering, I ended up, eventually, manually creating an account as she was unable to register. Several attempts at registration, her username wasn't in the admin userlist, so registration would appear to have stumbled at some point before completion too, although I can't verify exactly what/where the problem encountered was on the registration side of things.
This does appear to be an isolated occurence. Several registrations have gone through fine with no glitches whatsoever today, so it's not a global problem, and the forum has been as usual, with no other person mentioning login problems, so that isn't suffering problems either.
It's the fact that the condition is apparent on two different browsers that is surprising me. 
Could Windoze itself have an indirect effect in that regard? Might this possibly be related to a hardware, ie: firewall/router issue? Or possibly even software firewall related? I'm just at a total loss as to what to check next.
Thanks again.