To be more specific:
I now have no sidebar and widgets.
My footer has been wiped out.
Only 2 posts will appear on the home page.
A post that was originally excerpted correctly by WP now has no excerpt.
To top it all off, the plugin didn't work for the preformatted text post I was trying to shorten. (Apparently WP doesn't have the 55 word excerpt cutoff with preformatted text posts??)