[Plugin: WordPress SEO by Yoast] The keyword density is 0%, which is a bit low,

Same issue here.

I have a bit different message here, actually two contradictory messages:

‘The keyword density is 0%, which is a bit low, the keyword was found times.’

‘The keyword appears in the first paragraph of the copy.’

What does it mean? First message states,there are no keywords (not even 0 but empty space) second one acknowledges, keyword exists in first paragraph. Something is wrong with counting ??

Or am I wrong interpretting messages?

Yes I sometimes have the same.
The keyword appears a few times but it says it’s not there.
Try saving the page/changes. Sometimes it then corrects itself.

For me this plug-in doesn’t work at all. I have been using it for months and I rewrote the text a few times, updating my keywords, but my site is still invisible on Google.

Thank you lotsew. I have noticed the same… sometimes it shows better results for this parameter but I cannot find reason why. On some pages it works OK all the time on others never does.. really weird.

As to usability of this plugin and Google index. There is lot more to do than writing correct content only. Sitemaps submitting, backlinks, keyword research, maybe some paid links in catalogs, speed and code optimizing.

I never discuss with Google ?? they like good contend, I do. They want better code, I do. They want more links, I do. Of course it’s not easy work to do. It took me nearly 3 years to have 3 links on the first page but I didn’t want to invest much money so it took time. Be patient. This plugin is great!