Has there been any resolution to this problem?
I am running Zimbra Desktop build 1593 on WinXP and am experiencing the same thing that bbarons described, where the first mispelling is underlined but all others are not underlined. When I fix the underlined misspelling then the next one is underlined until I fix that one, and so on.
I'm not sure if this is relevant, but I see two instances of the following error in the error console:
Error: gAddonRepository is null
Source File: chrome://mozapps/content/extensions/extensions.
js
Line: 613