I cant view webite or log into admin — all white browser screen.

I had the same problem after updating to WP 3.2. It is a plugin causing the problem.If you can login to your cPanel and delete the “Tweet this” plugin you should be fine.It took two hours to work out the rogue plugin.Try it

Thanks! That seemed to do the trick for me.

Have got this problem 1 day after I successfully upgraded. Don’t have the “Tweet this” plugin though. Any idea what might have caused that?

Thanks!

There will be code in the plug-ins that is not correct or is in conflict with other code in your plug-ins or themes. To fix this is not easy, since several people have all had the same issue, I suggest it is a plug-in code that is the problem.
You could de-activate your plug-ins one at the time and find the culprit
Or de-activate all of them and then re-activate one at the time until you find the rogue plug-in
Once the plug-ins are disabled your site should be back to normal.
It is time consuming
Or you can get in touch with your hosting company and get support to find out the problem.
Another solution is to remove the plug-ins. You can do via ftp or via cpanel. Suggest you do a complete backup first.