[SOLVED][Drupal Ubercart] Review order page keeps looping back to itself
A few Drupal Ubercart users have noticed that the Review order page keeps looping back to itself after they click on the "Review order" button. The Review page simply loads with all the information the user has entered. If you are facing the same scenario in Ubercart in your Drupal installation then continue to find out the fix.
This error is normally caused by the presence of broken images, Javascript errors, erroneous stylesheet declarations in the checkout/review pages causing the unset() to be triggered. Simple look out for the presence of these items either manually or using Firebug to remove the loop.
Hope that helps.
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Reference: http://drupal.org/node/1785746