It appears that KML Tools are not yet compatible with 2014. I get the message:

Error Loading File kmlDate.rb
Error: #<SyntaxError: C:/Users/truga/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/kmlDate.rb:77: formal argument cannot be a global variable
...previewTimeLine") {|$kmlDateDlg, param|
...

etc.