Why have I never encountered that before? I've created many INSERT and UPDATE commands that insert to, or update, an ntext field and I've never experienced this problem.
Also, as I've mentioned, this only happens when I use the "Insert Hyperlink" option in iRite. If I remove the link, I don't have to specify the number of characters in the parameter and I can insert/update any number of characters into the ntext field.
I'm certain the problem relates, in some way, to the insert link option in iRite.