Trying to import a .csv mailing list that I created in excel on Mac. I go to TOOLS>> IMPORT and get "wizard screen" stating that it will import messages, address book entries..... While I can select "Address Books" there is no NEXT button to continue selecting file for import. I'm attaching (image 1) a screen grab of what my Thunderbird Wizard window looks like. Compared to (image 2) showing what it SHOULD look like. Very frustrated. Cannot add any email lists I create. Please help