Fields TabSequence not working in WebClient 6.0.4

I have noticed that tab sequence of fields in webclient and 6.0.4 are not working properly.

[attachment=0]tabSequence.jpg[/attachment]

When the user press tab after filling the first field the cursors goes to the browser address bar when it should go to the _userLoginName field.

Any clue?

BTW it works fine in SmartClient

if you have a sample for this please create a case (do test on 6.0.6 first)