Import Library adds blank line

I think I have asked this about a year ago, but if you forgive old fart, I need to ask again.
I think the "problem " was that some zipped files are of different format or get unzipped to "wrong" directory or something like that.

I have added zipped library ( DateTime), it shows up in the library list under grayed out "Contributed" , but when I try to add it to my sketch using Import Library it adds a blank line to the sketch.
I did same with zipped Time library and that one adds no problem.

Neither one of these libraries are in "standard" Arduino subdirectory Libraries.

Thanks Vaclav

Addendum
The real issue is - even when I copy the library to subdirectory of all of the other libraries the compilerr still cannot find it untill I give the compiler full path to the library.

The add-on question - where does the "contributed" menu come from and why the compiler cannot link to its libraries.
I think there is an ini file which has the answer. XP is currently searching for it.

Here is the original topic.

http://forum.arduino.cc/index.php?topic=201503.msg1484909#msg1484909

Thank you for finding the original post. After reading part of it I realized why I "forgot " about it. My first encounter with ....
Anyway, even making new directories in the "standard" libraries it still does not work.
I guess correct way is to skip Arduino site and search for the header file and hope there will be correct installations instructions there.

SOLVED