Widgets - options do not "install"

Wanted to install the OpenNTF File Manager widget (http://www.openntf.org/catalogs/a2cat.nsf/topicThread.xsp?action=openDocument&documentId=2DFAACEB82DE7876852576480020247F). Went to the File/Preferences section of client and the option to activate Widgets tool bar was not there. After several attempts, reinstalled client and the Widgets side bar was visible and the Widget option in File/Preferences was visible. Tried several times to drag and drop the OpenNTF widget as instructed, even tried some IBM widgets but they did not work either. Rebooted to see if that would help and now the Widget panel is gone and the Widget option in File/Preferences is not there either. Don’t know if related to my having to double click top tabs to move to different apps, as well as double click the bookmark icons on left to open apps. Perplexed. Skip