Trouble with activation Twitter in Mountain Lion

Hello,
My twitter accounts won't activate on Mountain Lion, I get a message saying that my credentials are wrong (I have tested them twice on twitter website and they are correct).
The only time I got Twitter working is when I did a clean install after the upgrade from 10.7.
With the upgrade, twitter didn't work, same error message.
With the clean install, I managed to activate my accounts, but when I tried to send a tweet from Safari, I got the same message: my credentials are wrong.
Any ideas?
Thank you !

Moved to Acrobat Installation & Update Issues

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