I'm on Drupal 7 and CiviCRM 4.6.25. Suddenly, I am no longer able to create or edit a contribution record. If I try to create a contribution record from a contact profile, the triangle spins eternally. If I try to create a contribution record from the menu Contributions > new Contributions, Once I submit the contribution I get a blank page. All I can think of is that I tried to setup the CiviXero extension last week but never got around to finishing the setup. I tried disabling/uninstalling it but that did not help with the problem. The Drupal watchdog is not showing any errors.