Not quite sure how to troubleshoot this since there hasn’t been too much of anything on the Forums about spell-check.
This is a new site that is on V2.2.1 - Build date 20110705 that started with that Build (not an upgrade/started clean with that version/build).
When a spell-check is performed, there is no indicator of the word that is misspelled, unlike V1.7 or 2.1.3 where there is a dashed underline. In addition, the font is in Times Roman. The stylesheet isn’t loading, or is missing for that section, period.
I’ve tested it in two different browsers, just to make sure it wasn’t a browser issue.
I’ve attached a screen print showing how the functionality is there for a misspelled word, and is missing the dashed-underscores.
It’s set to use the default CP theme.
The only add-ins are FreeForm, Sitemap, Strip HTML, and Word Limiter. Nothing outrageous from an add-in perspective.
I’ve re-uploaded the theme folder, just in case something got corrupted in the original copying via FTP, but other than that, not sure what to try next.