I get blank pages after just about every edit I do in dashboard and have the same problem when I sign in at the admin page.
The only way I can get into the dashboard is to sign in, then I get a blank page, I open a new window to my blog and it then has an edit link activated that I can use to get to the dashboard.
After I activate or deactivate a plugin I get a blank page and the action often does not occur.
I thought of throwing my mouse against the wall since its wireless and I've tried everything else I can think of.
Thanks for any help!