Drop-down menus not working in 3.0.7 Standalone

I just installed Zotero 3.0.7 Standalone on a new computer (Thinkpad W520, Win 7 64-bit). After installing and opening Zotero, the drop down menus (File, Edit, Tools, Help) don't work. Clicking on File causes the brief (<1 second) appearance of the drop down, then the words disappear leaving a blank box. This is also true for Edit, Tools and Help. Keyboard shortcuts also don't work. I can't find this issue in the Forums. Does anybody know a fix. As it is, I can't use Zotero on this computer.
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