With the new version of TinyMCE they changed the default image dialog box. The new version by default doesn't allow you to assign a CSS Case or horizontal/vertical spacing to an image. These are really nice features to have for clients so they don't have to go into HTML view to add a little padding around images.
I researched this and see that in order to turn on an advanced tab when inserting an image this needs to be added to the integration js script:
image_advtab: true
Here's an example of the full featured example with the more advanced image popup:
http://www.tinymce.com/tryit/full.php
It would be great if this was turned on by default in Mojo, but even if it was a configurable option we could set in the mojoTinyMCE.config file that would work. I tried to find where in Mojo this is being initialized but couldn't find it.