I couldn't change my ffm password on the settings page, but other than that, no problems. It may have cost me an app but hopefully not.
I had the same problem earlier today. Kept getting the following message:
The page you were looking for doesn't exist.
You may have mistyped the address or the page may have moved.
Sent them an email, but haven't heard back from them. Just went in and tried to change it again and it appears to have worked this time.
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Like magic I just received an email from HealthSherpa stating it was a "glitch" on their end and it has been corrected.