more information for this problem
i am including some snapshots to help give more info...
one is of the help-webassist list
another is of the file-siteimport-go menu from that choice.
and i also have an image of all tool extensions. i have not recently added any.
Since the original post i have added site assist, and was able to use it ok.
i also have cold booted and that also did not remedy the situation.