Just to add to this, I am seeing the same thing. The other weirdness is that I will see one page, say the homepage, with my tweets and then I navigate to an archive page and it shows “no public posts”. Completely weird. I am running super-cache and cleared the cache and then the problem reversed itself. (“no public posts” on the homepage and normal tweets on the archive page.) Very odd. I have temporarily switched to twitter tools, but liked the simplicity of Twitter for WordPress.