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This happened last year sometime but I don't recall any specific event triggering it.
One example is in our shoutbox if you use a ' it turns into /'
On our Main Menu block:
News & Articles
Now I have been able to go into the Modules admin and fix little stuff like that. But I can't fix the shoutbox. Because it was occurring in places outside the shoutbox I'm assuming its something sitewide but I have no idea.