I believe this has been my problem too. I purchased a new HP machine and the first thing I installed was Proseries (pro and basic) and was unable to get past the signin screen as described above. I found that entering the values in the user ID and password fields and then pressing CNTL-ALT-delete, then the escape key, that when the the input dialog was displayed again, the fields were displayed..

I also found that clicking the 'Signin' key after entering the two fields (even though they were not displayed) the application would let you in. From there everything worked just fine.

I'm going to the office to verify the listed fix works for me too.

Thank you so much. When I called support I was told that it was a Windows issue or that i should call HP.