Search does not search!

[jmaspv]

I've had the same problem, too, for quite some time, and neither of the two solutions above solve the problem. If I perform the search and then navigate to an item that I know has the search string, it will be highlighted, even though there were no Search Results. Seems to be the case only and always when the search string includes a digit.
Please let me know what further information would be helpful. As best I recall (!), this started around v3.5, and has been the case on up through the current v4.2b.