I recently updated my Moodle version from 2.5.7 to 2.6.4. Prior to the update, I could add a link on a small version of an image to a larger pop up version. Upon clicking on the image a larger pop up version would appear. In the latest Moodle version I have been creating a new course and I have been doing exactly the same thing with images. Now when the pop-up appears it is blank, a white screen appears. However, if I attempt to manually resize the window with the mouse cursor, the image suddenly appears. In previous courses, that were created in the earlier version, the pop-up images still appear without any need to manually resize the pop window. Any ideas of what could be going on here and what possible fixes might be?