26,000 crawl errors

[smkyle1]

I changed my permalink structure in my Wordpress blog and now have 26,000 crawl errors according to Google Webmasters Tools

1) I changed my permalink structure using Yoast's directions. Yoast provided this code, saying to add it to the top of the .htaccess file:
RedirectMatch 301 ^/([^/]+)/([^/]+)$ http://www.laprogressive.com/$2

2) I added it and got the following desired result:

It redirected posts from this structure http://www.laprogressive.com/category/post-name
to this structure http://www.laprogressive.com/post-name

3) But I also got the following undesired results:

a) It also redirected these two structures archival structures http://www.laprogressive.com/tag/tag-name
http://www.laprogressive.com/author/author-name
b) It did not redirect posts that were structured like this http://www.laprogressive.com/categor...gory/post-name

4) So I removed the statement from the top of the .htaccess file -- so now I'm left with the problem of having a permalink structure that I changed and no global way to ensure that the posts will get redirected

Right now, Google Webmasters Tools diagnostics says I have in excess of 26,600 crawl errors for unfound url's

The link to Yoast's page that talks to this issue:

http://yoast.com/change-wordpress-permalink-structure/

Anyone know how I can use Yoast's recommendation WITHOUT also losing the archival structure of my site?

Here is a link to my site:

http://www.laprogressive.com