I just switched over to using the Yoast plugin a few weeks back.
All of my title/meta descriptions are displaying properly except that I can't stop the date from showing in search results.
Under "title settings," I ticked the "Force rewrite titles" box and entered the tag %%excerpt%% for the meta description template; for both posts and pages. I made sure everything was saved properly, that was 2 weeks ago.
The post date is showing up is serps for posts only, not pages.
If you Google the search term--PROBIOTICS BRANDS-- (from the US), my post from the domain intestinaldysbiosis.com is the first result.
You'll see the date displayed (which I want to get rid of). It was last cached on Dec. 16th.
And modifications I made to the title tag and meta description are updated. The capital letters and the >> in the title are an example. I also changed the first letter of each word to capitals in the meta description.
So I'm sure the meta description has been updated. And I only made those changes a few days ago and they are showing. I tried to remove the post dates over 2 weeks ago.
I'm not very tech savvy, so if I'm missing something dumb, then I apologize. :)
I'm using the Suffusion theme.
Btw, just wanted to say thanks for this great plugin. Definitely better than All in One.