Hiya!
First of all: Yoast! Great plugins, and great guides on your site! Thank you for all your work.
Now my error message is very similar to the above:
“The plugin generated 734 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.”
might add: I had trouble updating plug in from 1.4.2 to 1.4.3, so had to delete the old one from wp-content/plugins and upload the 1.4.3 again
noticed: breadcrumbs not working anymore
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I’d like to add 1 more thing (unrelated aspect):
The — generate seo title — button (for posts and pages) that got removed with update to 1.4.2 was really useful because we could easily tweak titles, as opposed to now, when we click in the textbox it clears