I have a fully updated system. I am trying to setup Thunderbird for the first time and I wanted to import my email from an old Outlook *.pst file. So, I went to Tool --> Import, selected Mail as the types of items to import, clicked Next and I can't seem to do anything with it. The wizard has a blank window in which I cannot go to Next and I cannot select anything. It's as though something is missing/broken in the installation.