Upgraded to 4.6.7 and now the Register links in the Upcoming Events list block have a typo
In Views, I went to Edit view civicrm_events, Events List view.

Click on field CiviCRM Events: Start Date.
Under Rewriting, select the checkbox Output this field as link and make sure it is corrected to [yoursite]/civicrm/event/register?reset=1&amp;id=[id]. Then click Update and Save.