I just did a quick run-through with IE7, and I couldn’t replicate the error.
I just want to see if this is the correct sequence that you did (this is what I did)…
1) Finish typing up your post
2) Click on the “Check Spelling” link. This will highlight all potentially misspelled words with red underlining
3) Click only on those words that are actually misppelled, and select the correctly spelled word. So, for example, I didn’t click on “p.cornelissen2”, since that’s not actually misspelled.
4) When done, I click on the “Save Changes” link. This updates the textarea with the new version of my post, with the correct spellings that I selected.
5) Click on the “Submit Post” button.
Is this similar to what you did?