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In my posts, hover text terms do not appear any differently than regular text (though I can hover over them and see the hover text)! What gives?

The plugin currently makes use of the standard HTML tag acronym to specify the terms and their hover text. Browsers have default handling and display of acronym. It's possibly that the CSS for your theme is overriding the default display. I use the following in my site's styles.css file to ensure it displays for me in the manner I prefer (which, by the same token, you can use more CSS formatting to further format the hover terms) : acronym { border-bottom:1px dotted #000; }

Does this plugin modify the post content in the database?

No. The plugin filters post content on-the-fly.

Will this work for posts I wrote prior to installing this plugin?

Yes.

What post fields get handled by this plugin?

The plugin filters the post content and post excerpt fields.

Is the plugin case sensitive?

By default, yes. You can change this behavior via the plugin's settings page. Note that the option applies to all terms/acronyms. If you want to selectively have terms/acronyms be case insensitive, you should leave the case sensitive setting checked and add a listing for each case variation you wish to support.