The orange warning banner with the padlock was added because there's a bogus LW update showing up in search results. It's a 75.7 KB .exe & shows up as "Urgent LimeWire update - download & install now". If people download that thing they could end up infected. To try to prevent people from downloading a dangerous file, the warning banner was added to LW's interface.

The padlock symbol doesn't apply to music, movies etc...just to LW updates

Is your LW properly connected (all green/blue connection bars)?? If LW's connected, try the fixes below.

1. In LW go tools > options > searching > basic & check whether the 'show license warning' box is ticked. If it does, untick it > Apply > ok...see if that makes any difference.

2. Problems with the search

3. Delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will change all of your settings within LW's options, you'll have to go back through afterwards & reset things to the way you like them.

If LW's not connected, try the fixes in the post below. If nothing there helps, post back with your system details.
If LW Will Not Connect