I started installing EB5 (site already had v3 installed) and left it installing (Step 1) and went off to do something else. When I came back it was waiting to install the package (I chose install from directory) so I clicked to start. Because it had been sitting idle for a while, Joomla logged me out. I logged back in and the backend was completely white.

I went into FTP and deleted the EasyBlog folders in /administrator/components and /components and it reappeared. I then just installed it again. Maybe there's nothing you can do because of how it installs, but I thought I'd bring it to your attention. A reinstall fixed it.