I did a little more checking, and I put in some profile information for myself (address, along with some custom profile fields), then when I log back in by accessing the Active Directory signin.aspx link, it deletes all the information I just entered.

When I look at the DNN event viewer, I see  many log entries for my login that look like it's updating all my information with blanks or NULL's.  But I don't know why this is happening or how to stop it!  From the event viewer:

logdetail: <ADUserInfo><AffiliateID>-1</AffiliateID><DisplayName> Eric</DisplayName><Email>xxxx@xxx.com</Email><FirstName>Eric</FirstName><IsDeleted>false</IsDeleted><IsSuperUser>false</IsSuperUser><LastName>XXXXXX</LastName><Membership><Approved>true</Approved><CreatedDate>2007-03-29T00:27:23-04:00</CreatedDate><IsDeleted>false</IsDeleted><IsOnLine>false</IsOnLine><LastActivityDate>2012-10-16T11:00:12.827-04:00</LastActivityDate><LastLockoutDate>1753-12-31T19:00:00-05:00</LastLockoutDate><LastLoginDate>2012-10-16T11:13:07.1769308-04:00</LastLoginDate><LastPasswordChangeDate>2012-10-16T11:00:12.81-04:00</LastPasswordChangeDate><LockedOut>false</LockedOut><Password>xxxxxxx</Password><UpdatePassword>false</UpdatePassword></Membership><PortalID>0</PortalID><Profile><Cell /><City /><Country /><Fax /><FirstName>Eric</FirstName><IM /><LastName>XXXXXXXXX</LastName><Photo /><PostalCode /><PreferredLocale>en-US</PreferredLocale><ProfileProperties><ProfilePropertyDefinition><length>50</length><propertycategory>users_title</propertycategory><propertyname>users_title</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>TrustOnlineID</propertycategory><propertyname>TrustOnlineID</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>5</length><propertycategory>LastReviewedTrust</propertycategory><propertyname>LastReviewedTrust</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Name</propertycategory><propertyname>Prefix</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Name</propertycategory><propertyname>FirstName</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Name</propertycategory><propertyname>MiddleName</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Name</propertycategory><propertyname>LastName</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Name</propertycategory><propertyname>Suffix</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Address</propertycategory><propertyname>Unit</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Address</propertycategory><propertyname>Street</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Address</propertycategory><propertyname>City</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>0</length><propertycategory>Address</propertycategory><propertyname>Region</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>0</length><propertycategory>Address</propertycategory><propertyname>Country</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Address</propertycategory><propertyname>PostalCode</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Contact Info</propertycategory><propertyname>Telephone</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Contact Info</propertycategory><propertyname>Cell</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Contact Info</propertycategory><propertyname>Fax</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Contact Info</propertycategory><propertyname>Website</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>50</length><propertycategory>Contact Info</propertycategory><propertyname>IM</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>0</length><propertycategory>Preferences</propertycategory><propertyname>Biography</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>0</length><propertycategory>Preferences</propertycategory><propertyname>PreferredTimeZone</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>0</length><propertycategory>Preferences</propertycategory><propertyname>PreferredLocale</propertyname></ProfilePropertyDefinition><ProfilePropertyDefinition><length>0</length><propertycategory>Preferences</propertycategory><propertyname>Photo</propertyname></ProfilePropertyDefinition></ProfileProperties><Region /><Street /><Telephone>xxx-xxx-xxxx</Telephone><Unit /><Website /></Profile><RefreshRoles>false</RefreshRoles><Roles><string>Registered Users</string><string>Subscribers</string><string>CRM Users</string><string>IT Help Desk</string><string>Mail Room</string><string>Websupport Admins</string><string>appusersPropertyDamage</string><string>Document Moderators</string><string>WorkFromHome</string><string>Training Dept</string><string>Firm Notes</string></Roles><UserID>3</UserID><Username>xxx\xxxxxx</Username><GUID>5bc2c144e9d3c247b13a22e81cffa029</GUID><Location>xxxxxxxxx</Location><AuthenticationExists>true</AuthenticationExists><CName>xxxxxx, Eric</CName><PrincipalName>xxxxxxxxxxxxxxxx</PrincipalName><DistinguishedName>CN=xxxxxxx\, Eric,OU=IT Dept,OU=Users xxxx,DC=hra,DC=xxxxx,DC=com</DistinguishedName><sAMAccountName>xxxxxxi</sAMAccountName></ADUserInfo>

Server Name: XXXXX

Any help is greatly appreciated!