Well, I figured it out. I ruled out the issues mentioned in the links you provided (thanks).It wasn't about permalinks or the .htaccess file - those were all just fine. I found the solution deep in http://codex.wordpress.org/Using_Permalinks#Using_.22Pretty.22_permalinks.
About halfway down the page I found this:
Users of WAMP (Windows): Some versions of WAMP (all versions?) do not enable mod_rewrite or permit following SymLinks by default. To enable the required functionality navigate to the apache/conf/httpd.conf file, open with a text editor and uncomment the line LoadModule rewrite_module modules/mod_rewrite.so (i.e., delete the hash/pound sign at the front of the line). Then further down in the same file there is a section that starts with the line "Options FollowSymlinks". Change the second line in that section from "AllowOverride none" to AllowOverride all. Save edited httpd.conf and restart all WAMP modules. Your permalinks should now work.
The part I bolded and italicized did it!
Thanks for a great plugin!!