You can use this topic to discuss 7.5.3. Changelog is posted here

First post!

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With the spaces and login names, I've noticed a preceding space may be used with a display name. This makes it possible for two members to apparently have the same name, opening up a door to possible "identity theft" so to speak.

That used to be the case, especially with special characters turned on. Since 7.5 both the Login and Display names get passed through trim() before being added to the database.

In another post on the space issue with names. It was found that login names had the issue with no spaces in the middle of the name but public display names allowed spaces V7.5.2

With this bug fix are the space rules now enforced with both name fields now?

Yep spaces will now be allowed inside a login name, such as "Joe Blow", but not at the beginning or end.

Otay!!!

I have 7.5 and just earlier this week was able to change a member's display name to that of another's, but with a preceding space.

Just in case anyone asks. This should be out within probably about a week or so max. The only real thing I've left is to see if this works for those people having IE8 users that can't login.