The "add clip" button on the library panel does nothing. The "add clip" menu item (under Project) enables me to add only one clip to the project. The added clip is presented on the Clip Monitor panel, but it is not added to the Library. After that, no other clip can be added. I can't drag the clip to the tracks either.
Confirmed. If the library is empty the “added clip“ button is available. It should be grayed out as long as no clip is in the library.
This should be fixed. Please try with the current Kdenlive AppImage version 19.08.0a to see if there are any packaging issues https://files.kde.org/kdenlive/release/ If the problem/issue doesn't occur when using the AppImage, then it's your configuration or packaging.
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I tested using kdenlive 18.12.3. The bug is fixed.