When using the CRM software, if you login as any of your Contacts / Leads, you are automatically directed / logged in to a page called "CRMContactLogin".  Therefore, you will need to ensure that you have a page titled "CRMContactLogin" on your site for this to work correctly, and additionally, if you have Collector Sites, then this page will also need to exist on those specific sites as well.  Also, Registration Required access must be enabled for this page (in order for you to be able to logout from the account) and the page should be set to a Page Without Button in your admin area, since it is not necessary for this page to show up on your site's navigation menu.  If you have a Real Estate site, the recommended / suggested Page Type for this page is an IDX Listings Search Page Type and if you have an e-Commerce or General site, there is no specific recommended / suggested Page Type for this page.