Macmini lion hangs on grey login screen

After installing Lion my MacMini hangs every time I startup on the grey Login Screen. The 3 user Accounts can not be clicked on... Holding down the power button until the macmini is off and then pressing again once to start up a second time helps. Then it works like a charm. Has anybody a solution to this ? When is Apple coming with the first patch ? Such bugs are really windowish... brrr "Dislike"!   The same bug is worked around on Laptops with disabling some Energy Saving Options (automatic graphics ***) - but that's nothing for my MacMini, isen't it? Thanks for any help.

It works fine about every third time or so... but usally not. After Install of Lion 10.7.1   (I had some hope...)  nothing new... Every time I start the system I get the grey screen with the apple logo. Clicking the user accounts want do anything - shows no place to enter the PW. Then I force shutdown and all works fine again. What a clusterf...

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    I wish you that you solved your problem and that was just it!
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