I haven't seen or heard of any official solution from Symantec with regards to this. Please feel free to correct me if I'm wrong.
"~/Account/Default1.aspx" value isn't stored in a database. The page dynmatically determins if the user should view the account page to update their contacts.
The "HomePage" Attribute in [User] Table stores the page they will access immediately after their account was authenticated by ProcessManager. This value is usually NULL which will point them to the old default 'Home' page. If it's not NULL, the users might have click on "Make Home Page" at the bottom of the Portal and set up their own favorite page as HomePage.
Try changing the value in Master Settings > Users First Page Link to your new "Home" page as mention above (pageID guid is found in the Pages List > Edit Page > Advance as shown below)
and do a IISreset after the change. Get a user that has NULL value in their HomePage attribute to log in and see if it helps. If that works, you might like to get a DBA in to update any user that has set their HomePage to the deleted 'Home' or do it indivdually from the ProcessManager Portal.
If anyone has an easier way to fix this, please share.