Central Administration coming up as an http://500 Internal Server Error

Hi, I followed the instructions below to create a SharePoint 2010 web application, using Claims Based Authentication, and extending the application into the internet zone with Forms Based Authentication.  http://sharepointchick.com/archive/2010/05/07/configuring-claims-and-forms-based-authentication-for-use-with-a.aspx

The actual web application seems to work just fine, but I get a http://500 page if I go to Central Administration (http://domain:8080/), and at times I get a SharePoint error HRESULT: 0x80040E14 (if I enter the URL of the actual page within Central Administration (i.e. applications.aspx)).

I found that if I edit the Central Administration web.config file to remove the enabled="true" attribute of the tag <rolemanager defaultProvider="AspNetWindowsTokenRoleProvider"> that I can access Central Administration just fine.

I am not very proficient in server administration - is removing the enabled="true" attribute going to affect any authentication settings?  Is there a suggestion of a cause as to why the attribute is causing problems?  Any help would be appreciated.  Thank you.