I have looked through the issues queues and I cannot find anything that addresses this. I am fairly new to Drupal. If this is something obvious please let me know and I am sure others will benefit in the future.
This appears to have started happening with the upgrade from 7.19 to 7.20 Drupal Core. As in prior to this upgrade when we originally built this content the behavior was as expected - the images inserted via the insert module on a page opened in colorbox. This no longer occurs.
I have inline images that I have inserted using the Insert module which creates a link like the below.
The site is under development and I did not notice that this no longer worked until now when we are double checking prior to going live. Previously images inserted using the Insert module and selecting Colorbox - large as the format would open in colorbox when clicked on from within the page - apparently prior to the upgrade to 7.20. Now when clicked on the image opens directly, not in colorbox, and you only return to the page by clicking the back button on your browser.
There is likely something obvious I have missed please feel free to let me know. Any assistance is greatly appreciated. If this is an issue with the Insert module please let me know and I will post it there.