When a username has a dot at the end (by example "Tom M."), then any mail sent to that user containing his username in a html request field excludes this last dot from the link the user has to click on.
By examlple, such a link will have the form of "http://abcd.efg.hi/somefile.php?key=abcd&login=Tom%20M". (<- this last dot will be outside the link)
When the user "Tom M." now klicks on the link, he will get an error-message, because a user "Tom M" (i.e. without the dot at the end) doesn't exist.
Is there some kind of workaround? Or where should I look for?