In Notes 7 when spell checking a document with multiple rich text fields in a merged table, the spell check will crash the notes client if it is started in a rich text field in a merged table. The workaround for this is to either spell check the document from the first rich text field at the start of the text, or to remove the merged table.
Version 6.5x has a similar problem, though the user is able to cancel the spell check without crashing the client;
Version 5 is unaffected by this.
Dave