I think I’m having the same problem as mpromp2. I just upgraded to 3.4 and now when I log in to my dashboard the page comes up completely blank. I can get into the posts, media, settings, and the gallery through my blog, but I can’t access the dashboard, plugins, or themes. I don’t think anything has been deleted and my blog works just fine. I’m not sure what other information you need from me to help figure out what’s wrong.
I appreciate the help!