We have one user that has just mailed us with a curious problem:

1
I hit the landing page, but when I click on any link I get a 'page not found' error.

2
Also I tried logging in using "upperlower" same thing happened.
when I typed my login name all lower than it was ok. If I log in using MyUserName, nogood. If I use myusername - than it's ok.

Anyone any idea what is happening with those problems?

thank you

1. Ask what the exact URL is that they get the page not found error; it'll help in trying to reproduce. Also, try to find out the method they use to get to that page.

2. Keep in mind that in MySQL things are CaSe SeNsAtIvE, unlike windows in general. So whereby your username is one thing, trying to do it otherwise will fail; call it security.