I don't know anything about the tweak UI issue--so that one is yours, Crusyoldbloke!!
As for the pwl files....
Upon boot, the login will look for pwl files. If it finds none, then it assumes that this is the first time you have tried to log in this way. Because of that, it will give you the option to
A) put in a new username and password
B) just leave it blank, hit OK, (thereby disabling that login).
Hope this helps! Mudskipper
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Groucho said it best- "A four year-old child could understand this! Quick! Run out and find me a four year-old child: I can't make heads nor tails out of this!"