I've just updated my WordPress Blog to version 3.4.2 and now I can't log into the dashboard with a Mac but I can get into it with a Windows PC. I have tried manually updating using the FTP and I'm only using the twenty twelve theme so that should be an issue. The only plugin I'm using is the Twitter Pro plugin I disabled this in the dashboard and FTP but this didn't help.
When I try and log in on the Mac I get no error messages at all just the log in form clears.
The Mac is running 10.8.1 Mountain Lion with Google Chrome and The PC is Windows 7.
Thanks for your help