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I did just what you suggested, following the link you provided and created the Twitter Widget. It looks exactly as it should, without any errors as you can see at www.epicurus.com/members (my test area). There doesn't seem to be any issue with PageLines Framework. But, if you're still using PlatformPro, there may be, or, if you have other plugins, they may be conflicting with this widget.
Do you have a cache plugin? If so, don't deactivate it, but clear the cache. I still see a Coming Soon page.
Can you go to Dashboard > Appearance > Themes and tell me what theme is activated there?