[gb2world]

Hi valks1 -

I don't know if this has anything to do with what you are observing:

The first time I looked at your site in FF, I did not have javascript enabled. From what I can see, in 4.2, the css styles for the authentication box are controlled by javascript - so with javascript off, the styles look different.

When I enable javascript, the css for your authentication input looks like this:
class="menuInput menuInput-Blur"

which is probably not expected? You may need to take a look at any changes you made relative to the clearingInput function in the javascript here /skin1/jquery.clearinginput.js

Anyway - maybe what you are observing is the css defined in menuInput-Blur - which has a border style of inset, which would shade the left and upper border of the box.