It happened to me after some Ubuntu updates i think.
I had found the problem and the solution:
/usr/share/qt4/plugins/designer/libqwebview.so is missing.
Just find it and put it there and it will work.
** Changed in: qtcreator (Ubuntu)
Status: New => Confirmed
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QWebView widget missing in designer.
https://bugs.launchpad.net/bugs/674367
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