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I am newish to Joomla, I did a clean install of Joomla 2.5.8 and PHP 5.3.3
When I enable the User profile plug in so that the user can edit their information the page is blank, regardless of the template that I choose, I get the error:

Fatal error: Call to undefined function dom_import_simplexml() in /var/www/html/libraries/joomla/form/form.php on line 804

When I comment that and the next line out I get the page to display but the fields I want disabled are not disabled. This "dom_import_simplexml()" is throughout the form.php and only line 804 gives the error.

Any ideas?

http://osdir.com/ml/joomla/2011-06/msg00273.html

the above site, [youtube] video was sufficient to resolve my issue.