I'm suggesting here a solution I personally found for a bug in Infrastructure Map Server 2012 search widget using Fusion flexible layout. (I don't know if previous versions are affected too)
I use a $uservariable LIKE property search condition for the widget.
I finally found out that this depends on a JS code mispelling present in www/fusion/widgets/Search/ErrorPage.templ at line 59.
while (!node.fusion && node.parent)
You should have
while (!node.Fusion && node.parent)
with the capital F.
That's all. Let know if You are able to reproduce this problem and solve it, so maybe someone at AUTODESK will solve this in next Service Pack.