Newest Firebird 2.5.1 is the reason Search not to working.
So use prior 2.5.0 version.
Use either
Firebird-2.5.0.26074_1_Win32.exe
Firebird-2.5.0.26074_1_x64.exe
Which you can get from
http://www.firebirdsql.org/en/firebird-2-5-0/
Next Tings release will allow you to use 2.5.1 version.