Something installed would need to be using XML and not casting it during usage at profile update. I can't recall anything of ours that does this. A quick search shows an issue in Joomla that causes this when using Joomla Captcha, but this shouldn't be an issue for profile update as we don't use Joomla captcha.
Please ensure your Joomla install is up to date as 2.5.9 is latest.
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thanks, I found the error.
it was the plugin from nordmograph (Geommunity Geocoder)
from
geommunity.nordmograph.com
I disabled the plugin and now it works.